If you're looking for a WiFi network to connect to so as not to consume your data, Wifi Connecter Library can help you out. Once you've located the networks, you can use the libraries to break the passwords and access them.
An application to audit wireless network security
It's a useful application for network auditing, so if you're thinking of using this Android app with networks regarding which you don't have authorization, you'll have to do so under your own responsibility.
Find weak points in WiFi networks.
The fact is that this application doesn't work alone. To get it going you have to install the APK of complementary app like WiFi Analyzer, that monitors different aspects of a network such as its intensity or encryption.