Net/mini stumbler does everything that you are allowed to do legally.

- locate APs
- Discover encryption type
- Discover SSID
- Discover signal strength and area noise
- Discover their geographical location using GPS

That's wardriving guys. All the open source programs do the exact same thing, except that one or two of them have WEP decryption capabilities. And don't even try and tell me that you want to start breaking WEP encryption keys from companies that you don't own.