WiFi Map - A crowdsourced list of routers and passwords
WifiMapper - Find free WiFi anywhere in the world
Get Free Fucking WiFi - Find the best fucking WiFi just around the corner.
LocationAPI - Instantly locate any device w/ WiFi, celltowers & IP address
Instabridge - Crowdsourced free wifi (now on Android)
SiFi - Airbnb for your Wi-fi connection