Android: Joining the Wi-Fi network at a friend's place is more of a hassle than it should be. Instabridge solves the problem of illegibly scrawled Wi-Fi passwords by letting your friends invite you to join their networks from their phone.
Instabridge is an elegant solution to a problem we've all experienced before. If you're connected to a network, you can invite any of your friends to join the network without having to locate and type in the password. If you decide you don't want them on your network anymore, you can remove them. Obviously, you should only do this with people you trust, lest you open your Wi-Fi to the entire world. Check out the security info for more on how Instabridge works.
The app only works on Android now, but the site hints at future releases on other platforms. Download it now at the link below to try it out.