When the Orioles need to fly a last-minute call-up from, say, Norfolk to Minneapolis, Kevin Buck, the team’s director of travel since 2009, employs his favorite travel apps to ensure the player is in the dugout by game time. The team charters flights well in advance for road games during the regular season, but player injuries and roster shifts often necessitate hastily summoned substitutes.

Fortunately, Buck has help at his fingertips. He uses Kayak’s app to book the 100 or so urgent flights he coordinates each season.

“It’s a really easy way to find flights quickly,” he says. And to get players from airport to ballpark, Buck likes Uber for reserving a private car. “It’s been a huge help,” he adds.

Apps make traveling easier. Think of them as a palm-sized travel agent, concierge, and savvy local available 24/7. Apps can find the cheapest flight, help you pack, hail a ride, and even reserve a parking spot. One in four travelers books trips via mobile device, according to industry studies, and mobile travel reservations are expected to at least triple in the next two years. Many travel apps are hard to use or a waste of space on your smartphone screen.

We’re here to help you sort through it all with this list of essential apps for a bon voyage. (Unless otherwise noted, downloads are free for the operating systems listed.)

Book ‘Em

HotelTonight: The gold standard for same-day hotel apps, HotelTonight’s user-friendly interface summons a vetted selection of deeply discounted rooms. Time-pressed travelers need just 10 seconds (three taps, one swipe) to make same-day reservations at fill-these-rooms markdowns. The app rates hotels (“hip,” “luxe,” “basic,” “charming”) and offers room descriptions. Favorite feature: express check-in. (Android, iOS, Windows Phone)

Kayak: Beloved by one-stop trip shoppers, Kayak has become the Swiss Army knife of search-and-reserve apps. Find good deals on flights, lodging, and car rentals, and use it to track flights, manage itineraries, and receive price alerts. Flight searches can be filtered to suit your tastes, for instance, in flight times (no red-eyes, please). Favorite feature: explore budget-based vacation options. (Android, iOS, Windows Phone, Amazon, Kindle Fire)

Hipmunk: The cool kids’ flight-and-hotel aggregator, Hipmunk is famous for its Agony and Ecstasy indexes. The former ranks flights by painfulness, flagging “ugh” factors like multiple layovers and sky-high prices; the latter rates accommodations by desirability, highlighting value and amenities. Travelers can then book through the app. Favorite feature: searches integrate with iPhone, Google and Microsoft calendars. (Android, iOS)

Booking.com: Extensively critiqued lodgings, discount rates, and a pay-later feature make this app a hit. Not all of Booking.com’s hotels, B&Bs, villas, and other properties let you lock in a rate sans credit card. But filters help users find the right room at the right price. Favorite feature: 24/7 customer helpline. (Android, iOS)

SeatGuru: Fed up with bruised knees and no laptop outlet? SeatGuru lets fliers consult 700-plus airline cabin maps to determine where they do (and don’t) want to sit. Designed to suit the pickiest passengers, this app offers seat-by-seat descriptions (width, legroom, reclinability, window alignment, and power availability), plus reviews by fellow fliers. Favorite feature: Guru-rated flight searches. (Android, iOS)

Get Ready

TripIt: The efficient traveler’s go-to app, TripIt organizes flight, hotel, rental car, and other confirmation numbers and reservation information into a unified itinerary available instantly on your mobile devices. Forward travel e-mails to your free TripIt account or have the app automatically cull items from your inbox. (Auto-importing is not available for all e-mail domains.) Favorite feature: supplies maps and weather forecasts. (Android, BlackBerry, iOS, Windows Phone)

PackPoint: Part valet, part mom, this packing-list generator uses your travel information to customize your checklist. Tell PackPoint your gender, where you’re going and when, and what you’re going to do (fancy dinners, hiking). The app does the rest, suggesting clothing, gear and gadgets you can’t leave without. Favorite feature: syncs with TripIt to obtain personal travel info. (Android, iOS)

The Weather Channel: This popular app puts television’s favorite weather broadcast into your pocket or purse. Easy to navigate, TWC app supplies travelers not only with current conditions at their location, but hourly and 10-day forecasts, local airport, beach, and boating conditions, radar, UV indexes, and weather news. Also searchable for weather forecasts/conditions at your destination. Favorite feature: customizable weather alerts. (Android, BlackBerry, iOS, Windows Phone, Amazon, Kindle Fire)

Yapta: Nothing sours a trip like discovering—too late—that you’ve overpaid for your flight. This price-tracking app alerts frugal fliers to airfare reductions so they can book with peace of mind or claim a refund/travel credit for booked flights. Yapta also tracks hotel prices, allowing users to reserve when the rate is right. Favorite feature: easy-to-use interface means you don’t need to log in for updates. (Android, iOS)

Have Tools, Will Travel

FlightAware: This omniscient flight tracking/airport status app keeps tabs on just about everything aviation. Track commercial and private flights worldwide by airline, flight number, or route. Consult airport arrival/departure boards. Monitor gate/terminal changes and weather. Get airport delay information and receive automatic alerts. Favorite feature: airport delay “misery map.” (Android, iOS, Windows Phone)

Google Maps: No other map app comes even close to competing with Google Maps. This ubiquitous tool offers voice-guided GPS navigation for drivers, pedestrians, transit riders, and cyclists, supplemented by conventional, street-view, terrain, satellite, and 3D images. Search nearby dining, shopping, and attractions to see reviews and hours, make calls for reservations, and let Google guide you there. Favorite feature: faster-route traffic alerts. (Android, iOS, Windows Phone)

OpenTable: Employ this mobile concierge to make dinner reservations anywhere. Search for restaurants by location or name, browse top and trendy dining spots, and then let OpenTable search for available dates and times. When you’ve chosen one, book it with one tap. The app instantly confirms the reservation and sends you a reminder in advance. Favorite feature: invite your dining companions. (Android, BlackBerry, iOS, Windows Phone, Amazon, Kindle Fire)

Entrain: Smartphones readily adjust to new time zones; not so your body. Developed by University of Michigan researchers, this app develops a personalized lighting exposure agenda to help your circadian clock quickly adjust as you travel. Input travel plans, wake-up and bed times, and Entrain formulates optimal hourly light exposures. Favorite feature: metrics page graphs your body’s progress. (Android, iOS)

Instagram: Postcards for the 21st century, Instagram lets you take travel photos (and videos) with your smartphone, enhance and caption them, then share them instantly on Facebook, Twitter, Flickr, and other social-media sites. The app’s filters make even ho-hum vacation pics look professional. Favorite feature: display photos on personal map. (Android, iOS, Windows Phone)

Get the Scoop

TripAdvisor: When TripAdvisor predicts Wildwood, NJ, will be the hottest under-the-radar destination in the country this year, believe it. (We swear, this is not a joke about Jersey.) The app provides access to more than 200 million reviews of hotels, restaurants, and attractions by travelers like you. Download its City Guides for top picks and maps of your intended destinations. Favorite feature: Guides can be accessed for offline use. (Android, iOS, Windows Phone, Nokia)

Yelp: Looking for a wine bar near your hotel? Yelp can find the closest, display customer reviews, and offer directions. This popular business-locating app integrates each establishment’s basic info with maps, photographs, ratings, reviews, menus, and more. Search by category, price, proximity, and rating. Favorite feature: messaging lets you query locals directly. (Android, iOS, Windows Phone, Amazon, Kindle Fire)

AroundMe: Do you really need two local-search apps? Maybe not, but devotees of AroundMe prefer this thoughtfully designed, graphic-oriented app to Yelp. Choose a category icon (e.g. banks, coffee shops, movie theaters), tap, and AroundMe swiftly lists options and pinpoints them on a map. Selecting one provides detailed information and reviews. Favorite feature: uses GPS to give you directions. (Android, iOS, Windows Phone)

GateGuru: This handy travel-day companion stores your flight info and provides live updates on delays, cancellations, and gate changes. But GateGuru’s genius is its local intelligence about airport amenities and maps, particularly those in your vicinity. Use it to find restaurant options and see how fellow fliers rate them. Favorite feature: in-app discount car rentals. (Android, iOS, Windows Phone)

Keep Rolling

Uber: The mobile way to hail a ride, Uber uses your phone’s GPS to locate the driver nearest you and dispatch your preferred conveyance: taxi, sedan, luxury vechile, or SUV. The app estimates pickup time (and fare), texts you when your ride arrives, and automatically charges your on-file credit card once you’ve reached your destination. Favorite feature: GPS monitoring of driver’s progress. (Android, BlackBerry, iOS, Windows Phone)

Waze: This app provides real-time, driver-sourced traffic and navigation advice. Waze’s legion of local eyes on the road will alert you to traffic jams, road closures, and speed traps before you’re ensnarled. Also provides step-by-step navigation. Favorite feature: closest and/or cheapest gas station locator. (Android, iOS, Windows Phone)

iExit: Traveling I-95 with two kids clamoring to eat at Olive Garden? This app’s for you. Pinpointing your location/direction via GPS, it tells you what lies ahead exit by exit (up to 100 of them) so you can plan gas stops, bathroom breaks, meals, lodging, and other road-tripping necessities. Use for pre-planning or en route. Favorite feature: favorites list for quicker searches. (Android, iOS)

Specialty Travel

Airbnb: This private-lodgings app lets you research and reserve distinctive digs in dreamy locations. Users can communicate with their hosts, browse destinations, and imagine themselves slumbering in cottages, castles, windmills, and houseboats. Favorite feature: shareable Wish List. (Android, iOS, Windows Phone)

BringFido: Accommodating furry family members on your travels can be a hassle. BringFido is a dog-lover’s best pal for finding pooch-friendly hotels and attractions like dog parks, doggie beaches, and restaurants where Rover is welcome, too. Research airline and hotel pet policies, and see which hotels and attractions earn BringFido’s coveted 5-dog-bone rating. Favorite feature: pet travel helpline. (iOS)

Cruise Finder: This vacation-planning app searches more than 20 cruise lines, 220 ships, and some 12,000 itineraries worldwide. Filter by cruise line, destination, departure port or date and the app lists your options. Peruse stateroom descriptions and prices, deck plans, and amentiies. Favorite feature: track favorite cruises for price alerts. (Android, iOS)

Green Globe: An app for the carbon-conscious traveler, Green Globe features hotels, resorts, attractions, and cruise lines that meet its sustainable tourism standards for energy and water consumption, recycling, and all-around earth-friendliness. Such rigorous vetting limits your choices, but once you’ve found a certified green hotel room you’ll sleep with a lighter conscience. Favorite feature: app-enabled hotel booking. (Android, iOS)

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App Chat

Marian Marbury, founder, Adventures in Good Company, women’s guided travel. Recent Travel: Galapagos Islands, Mongolia. Next Destination: Morocco. Techie Tip: “I love Hipmunk’s Agony index. It will rate flights, in part, by how awful the connection is. It has a really nice graphical [flight] layover index.” Also Likes: Trivago (hotel meta-searches), SugarSync (cloud file-sharing).

Kevin Buck, director of travel, Baltimore Orioles. Recent Travel: Dominican Republic, Sarasota, FL. 2015 Dream Trip: the World Series. Techie Tip: “We try to get Uber on all our players’ phones so they can get a ride easily without having to pay cash.” Also Likes: FlightTrack 5 (flight tracking), WeatherBug (real-time weather).

Jan C. Miles, captain, tall ship Pride of Baltimore II. Recent Travel: Chesapeake Bay. 2015 Destination: East Coast, Maine to Carolinas. Techie Tip: “When you go from city to city with Pride, you’re looking for local knowledge. You get off the ship and you [want to know] how to get from here to there from a walking point of view.” Also Likes: Citymapper (urban transport), PassageWeather (marine forecasts).

Local Apps

Favorite apps to help you explore Charm City.

Parking Panda: reserved parking for the plan-ahead driver. (Android, iOS, Windows Phone)

Charm City Circulator: route map, service updates, mobile alerts, plus real-time bus tracking to forecast arrival times for the free shuttle service. (Android, iOS)

Explore Baltimore Heritage: GPS-guided city history featuring over 50 landmarks (with stories and photos) and 12 themed, self-guided tours. (Android, iOS)

NPS Chesapeake Explorer: National Park Service guide to parks, outdoor activities, trails (historic, scenic, water), and tours in the Land of Pleasant Living. (Android, iOS)

Something about the empty driveway next to his off-campus house in
Georgetown always bugged Nick Miller. But he couldn’t quite put his
finger on it. Not until a trip to a Baltimore Ravens’ game took him
through Federal Hill. There, driving with friends, desperate for
parking, Miller saw residents holding up cardboard signs advertising
spaces for rent. And it hit him. Sure, parking demand reaches naturally
epic proportions on game days around M&T Bank Stadium; Miller, who
grew up in Harford County, knew that. But finding convenient downtown
parking in Baltimore and Washington, D.C., was always like searching for
a needle in a haystack. Could digital technology, he wondered, fill
those empty driveways, lots, and parking pads with actual cars in real
time?

Brainstorming with computer programmer Adam
Zilberbaum at the first Baltimore StartUp weekend, Miller’s epiphany led
to a prototype for a user-friendly, peer-to-peer parking website and
app. That was three years ago. Today, Parking Panda,
which receives a cut of all transactions, makes locating and reserving a
parking spot as easy as purchasing a seat online at Center Stage or
Camden Yards. To date, Miller—just 25, low-key, and usually unshaven—and
Zilberbaum, 31, have raised nearly $5 million in financing. They’ve
added 18 employees, expanded to 40 cities, and bolstered their operation
to include commercial parking garages.

But if their concept was
merely a one-off success, albeit a welcome help to alleviating downtown
traffic woes, it would just be a nice entrepreneurial story and end
there. It doesn’t. It barely scratches the surface.

When
Miller——who today bikes from his Fells Point apartment to his Federal
Hill office—travels out of town, he does what a rapidly multiplying
number of young adults do: He seeks out similar peer-to-peer services.
Rather than dropping a couple hundred dollars on an impersonal hotel for
a few of nights, he finds an inexpensive room he likes—and maybe
interesting hosts—online via Airbnb,
which enables almost anyone to turn their home or apartment into a
B&B by renting a spare bedroom. Instead of wasting money on a rental
car that will mostly sit idle, he’ll go to his smartphone to hook up
with a Zipcar, hop a ride with a Lyft driver, or tap Uber’s taxi-on-demand app. In D.C., he might use the city’s massive bike-sharing program.

All of which, like Airbnb, and a laundry list of related platforms, are taking hold in Baltimore, too.

In
fact, when Miller and Zilberbaum first began developing Parking Panda,
they were harbingers of a profound cultural shift. Enabled by mobile
technology, pushed by changing millennial values emphasizing
sustainability and creativity, and fanned by the economic slowdown—it’s a
transformation described as “the sharing economy.” Simply put, the
people born between 1980 and 1994—the largest and most educated
generation in U.S. history—are choosing to live differently and
reshaping how cities, including Baltimore, function at basic levels.

“There
are many different factors at work, and it can be difficult to separate
cause and effect,” says Susan Shaheen, co-director of the University
of California, Berkeley’s Transportation Sustainability Research Center.
“There’s been the wholesale introduction of wireless smartphones and
applications, but there’s also been a dramatic change in the younger
population—a reduction in the number of people getting driver’s
licenses—and a deliberate move away from suburban lifestyles. This
generation wants to live in urban areas with the culture and community
that affords and not have the burden of vehicle ownership.”

Raised
on “sharing” models from Napster to Spotify to Netflix—millennials have
also been referred to as “the cheapest generation.” Partly, this was
born out of necessity, things like exploding college debt and a horrific
job market. But millennnials always seemed fundamentally opposed to
paying for things previous generations took for granted—like music,
newspapers, and cable TV. Now, they’re not buying cars and houses at the
rates of previous generations. And, they are the first generation,
according to a recent study, to value their smartphones over their cars.

For them, it’s not much of a leap to use digital technology to share bicycles, handsaws (NeighborGoods), used clothes (thredUP), automobiles (RelayRides), pet-sitting duties (DogVacay)—or
even an apartment for a few nights. Especially if it’s more convenient,
less expensive, and maybe offers a more rewarding personal
transaction—another millennial value. (It’s called social media for a
reason.)

Got the money, but not the time? Find someone on Taskrabbit to run that errand. Need funding for your nonprofit? Indigogo
can help. Cash to make a movie? Baltimore filmmaker Lotfy Nathan raised
more than $30,000 for his documentary, 12 O’Clock Boys. Even though
millennials aren’t going to stores to buy music or movies, they will
support something they care about—if they can feel like a part of the
project.

“I think what Parking Panda, Zipcar, or Uber, Airbnb, and
these models do really well is more efficiently utilize existing
resources,” Miller says. “I think this generation is hardwired to think
that way. There’s a move toward ‘experience’ and away from ownership.”
If it’s more adventurous, like jumping in the front seat of a hot
pink-mustachioed Lyft car, charging your phone, and chatting with the
driver—probably about the same age—or getting the insider tip on the
best neighborhood dive bar from an Airbnb host, all the better.

To
listen to Miller, it was the desire for efficient logistics and
creative opportunities that led him to move into the city. “I love it,
but I didn’t necessarily anticipate that growing up [in a rural
county],” he says. “I can walk to Canton Square. There’s a culture, an
art scene, museums. I like to do a lot of things, and all that’s
possible because of the neighborhood I live in.”

Of course, the
new peer-to-peer models don’t just afford the chance to save
hard-to-come-by wages, but generate income on the other side of the
equation. Shaina and Trevor Holman, both in their late 20s and from
suburban North Carolina, decided to buy a house in Hollins Market when
she got accepted into the University of Maryland School of Dentistry.
“Our parents were like, ‘Buy a house in the city?,’” Holman laughs. “But
we found this neighborhood that is a really a good fit.” They get by
with one car—a “car-lite” household—because she can walk to school. And,
for the past year, they’ve made between $900 and $1,600 a month renting
a bedroom on Airbnb.

Holman learned about Airbnb from a neighbor,
who earned enough to quit her full-time job and launch a start-up
company. Three other neighbors are also renting rooms now, and her
husband, once his contract job expired, launched his photography
business while the extra income was streaming in. Holman admits that,
initially, there was a bit of an “ick factor” about inviting strangers
into their home, but she got past it. “It’s amazing how quickly you
become friends with some of the guests,” Holman says. She recommends
nearby Zella’s Pizzeria and CUPS Coffeehouse to visitors and helps them
navigate the city. “We still keep in touch with people who were here
just for two nights.”

A large factor in the confidence in
peer-to-peer models like Airbnb, Holman notes, is that people on both
ends are required to register online, get verified through social media
like Facebook, and then provide user reviews. “Like Yelp,” she chuckles.
“I was nervous about that, too, but it makes everyone want to leave a
good impression.”

In terms of how the new business models are
playing out in urban areas, physically it’s most apparent in
transportation. Some cities have wrestled with regulating the
peer-to-peer models, but Baltimore, so far, has taken a hands-off
approach.

Billy Hwang, of the Baltimore City Department of
Transportation, and a Gen-Xer, can’t help but laugh when he hears
Shaheen’s phrase, “the burden of vehicle ownership” repeated. He sounds
stunned by how fast changing millennial priorities and emerging
technology have affected urban planning.

“In my generation, the
first thing you did when you turned 16 was take your driver’s test,”
Hwang says. “Now, you look at something like bike-sharing. Five years
ago, that was a farfetched idea.

“The iPhone sparked a revolution
that’s been spilling over into transportation for the last two to three
years,” Hwang continues. “We’ve never seen anything like this—where
non-transportation technology is driving changes in transportation.”
Wireless radio-frequency identification, for example, is what enables
Zipcar members to open a car door with a swipe of an ID card or a
bike-share member to unlock a bicycle from a station. Also new: the
ability to track Charm City Circulator arrival times on a smartphone.

“When
we look back, we might put the turning point at 2010, when peer-to-peer
car sharing started in San Francisco and bike-sharing came to
Washington,” says Shaheen, who has studied transportation for 17 years.
“The phenomenon of ‘shared’ mobility is occurring and gaining
momentum.” (Hwang might add it was the same year the iPhone 4, still the
most popular iPhone, was released.)

Case in point: There are
currently bike-sharing programs in 46 U.S. cities, and Charm City
Bikeshare, Hwang confirms, will break ground this spring with 25-30 bike
stations. If doubts remain about the popularity of such bike and
ridesharing systems, consider that D.C.’s Capital Bikeshare accounted
for nearly 2.5 million trips last year. And that New York City’s
bike-share program posted 5 million trips in its first five months last
year. Or that Lyft, now in 18 cities, surpassed 1 million trips in
August, in its first year in business.

Zipcar, too, which arrived
with a handful of cars on Baltimore college campuses, has also expanded
dramatically. With 200 cars in the city, it’s now working closely with
the Parking Authority to reduce downtown parking demands, as well as
their Parking Authority fleet of vehicles. Parking Authority spokeswoman
Tiffany James, a married Hampden mom with twins, says Zipcar allowed
her family to sell one of their cars. “We have people who have asked us,
‘When can we get Zipcar in our neighborhood?’” James says. “Patterson
Park’s neighborhood association cheered when we introduced Zipcar.”

Jeremy
Pomp, who works for Zipcar, is from Harford County, just like Parking
Panda’s Miller. In many ways, his story parallels changing millennial
values. At 33, he’s old enough to have suffered through the worst of his
generation’s financial woes, having bought a house before the 2008
crash and then watching it lose 30 percent of its value almost
overnight. Today, he and his wife rent an apartment and live with their
two children near Ridgley’s Delight, also getting by, happily, with one
car—a 12-year-old VW Golf. Pomp bikes his 4-year-old daughter to school
before riding to work in Mt. Vernon. He takes advantage of previously
unavailable digital and GPS technology to live more efficiently—i.e.
less time in the car. “If we are out of peanut butter, I add it to the
list and order with Relay Foods [an online grocer now in 10 cites], and
they’ll deliver it.

“Zipcar, bike-share, Uber—these things
complement each other,” he continues. “And they are really about
removing barriers to living in the city that have been built up over
time.” His mother, he notes, grew up in Patterson Park when most
families got by with one car or no car, borrowing a neighbor’s for
weekend grocery shopping, if necessary. In that way, he says, new
technology is actually enabling people to live in downtown neighborhoods
more like they way people used to.

Shaheen agrees that the idea
of “sharing” resources isn’t new. It’s what people did in previous
generations before a 50-year splintering to the suburbs. At the same
time, she cautions about overstating the trend toward urban living among
millennials, who have also been delaying marriage and children.
“There’s still time for them to move to the suburbs,” she says. In other
words, there’s still no app for improving city public schools, or
lowering poverty and crime rates.

However, Holman, who is
pregnant, says she and her husband do not plan to leave the city. She
admits, though, that once the baby arrives, they plan to put a hold on
Airbnb.

“I don’t feel comfortable about having strangers in the
house with a baby,” she says. “But what’s funny, is that our parents—who
thought we were crazy to buy a house in the city and then crazier to do
Airbnb—are now like, ‘That’s a lot of money you’ll be losing. Are you
sure?’”

Ron Cassie is a senior editor at Baltimore.