Backed by First Round Capital and Google Ventures, Glimpse released a new version of the app in August (it initially launched in February 2014).

5. Peek

To discover and book activities for your travels, turn to Peek.

A personality quiz takes in user preferences (street art or fine wine? Sports cars or the Eiffel Tower?) and then offers personalized activity suggestions.

The app has real-time booking options, and users can search a calendar for events on specific days. Activities are added from tastemakers like Diane von Furstenberg, Wolfgang Puck and Tory Burch. When users book, Peek takes a cut from activity operators but users don't pay anything extra.

It covers 24 cities at the moment (everything from New York and Las Vegas to Cancun and Paris) but plans to continue expanding coverage of the U.S. and Mexico.

Peek has raised $6.5 million in funding from Google's (GOOGL, Tech30) Eric Schmidt andTwitter's (TWTR, Tech30) Jack Dorsey, as well as travel experts like Carl Sparks (former CEO of Travelocity).

6. Traveling Spoon

It's not technically an app (yet), but Traveling Spoon is worth opening up a browser for.

Imagine having a friend's mom prepare you a home-cooked meal in every country you visit. Traveling Spoon founders Stephanie Lawrence and Aashi Vel are making that a reality. Through the site, travelers can reserve a spot at the table of native hosts, all of whom have been vetted by the founders.

The "chefs" (25% of whom have a culinary background) will cook lunch or dinner ($20 to $60), or provide a cooking class and a market tour ($80 to $170).

"Culinary tourism is a catalyst for complete cultural exchange," said Lawrence. "Beyond making the world a smaller place, the program also provides valuable income to hosts working to support their families."

There are currently over 125 hosts in 35 cities across 14 countries. Lawrence and Vel have focused their efforts on southeast Asia but plan to expand to Greece soon.

7. WeSwap

Instead of dealing with banks and costly exchange rates, London-based startup WeSwap offers a peer-to-peer exchange.

Customers connect their WeSwap account to a bank account and are given a prepaidMasterCard (MA). When traveling, users request to exchange funds with another user who has the desired currency. Any new funds are accessed through the MasterCard.

Each transaction incurs a 1% swap fee -- unless a match can't be found in time, in which case WeSwap steps in (this incurs a 1.5% fee).

With anti-money laundering measures in place, it's safe to make swap with anyone on their platform.

Right now, it's only available to customers in ten European countries but founder Simon Sacerdoti says they'll "absolutely" expand to the U.S. in the future.

They've raised $3.75 million in funding and are in the process of closing a larger round of founding.

8. Flight Tonight

The name pretty much says it all: This app makes it super easy to book last minute flights for the spontaneous traveler.

Flight Tonight, which launched in late July, is from the brains behind travel startup Hopper (founded by former Expedia (EXPE) engineers).

The app aggregates cheap fares from your "home" airport departing in the next 24 hours. Flights are booked through the airline or travel site, and Flight Tonight takes a standard agency commission for the referral (which varies depending on the site).

"Customers have been trained that buying flights is complicated and takes a lot of time," said Hopper chief data scientist Patrick Surry. "We're saying, 'Why should it be so difficult?'"