GeoSpark - Location tracking SDK with 90% less battery drain 🔋
Instabridge - Crowdsourced free wifi (now on Android)
Pilgrim SDK - Foursquare's superpower is now available to all developers
Get Free Fucking WiFi - Find the best fucking WiFi just around the corner.
Hit Me Up! - Get notified when your friends arrive/leave a location!
WifiMapper - Find free WiFi anywhere in the world