Platform: iOS, Android; Free

If the travel bug is hitting you during the summer (as it should), you might want to go to a few places where hotels don't cut it. Airbnb is a social site that aims to connect travelers with people who have space to share. With the Airbnb app, you can book a space, find some last minute spots, and keep in contact with the hosts. Hey, you can even take it a step further and see how much your place is worth to rent out if you're not going to be there while you're out and about. Be careful if you're in New York though, renting out your apartment could cost you a fine if you're caught.