FareUpThere - Earn rewards for your feedback on flights
DNScapy - DNScapy is a DNS tunneling tool. The code is very light and written in Python.
RoadGoat - Map where you've traveled. Get matched with best places to go next!
Iodine - iodine is a free (ISC licensed) tunnel application to forward IPv4 traffic through DNS servers (IP over DNS). Works on Linux, FreeBSD, NetBSD, OpenBSD and Mac OS X.
Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
Navisens - Indoor & outdoor location without beacons, WiFi, or GPS