Definitely andOTP, my two-factor authentication app for Android: https://github.com/andOTP/andOTP
The only thing cooler will be once I finished to rewrite it from scratch to get rid of the legacy code from before I forked it.

Oh and the second thing I'm pretty proud of is my terminal emulator: https://github.com/flocke/sterm
It's just a minimal terminal for tiling WMs without any frills. Basically it's a wrapper that reads options from an INI file and aplies them to an instance of VTE. No context menu or complex functions, just a simple terminal.

Heeey, andOTP looks like just what I've been looking for! Any way to migrate Google Authenticator?

@gronostaj There is this Python script: https://github.com/puddly/...

But it requires a rooted phone to get the data, since Google Authenticator doesn't allow exports.

Dude, I'm awarding you my coolness badge :D

Great job, mate! I'm using andOTP everyday and loving it!

Oh shit you made andOTP?!?! My friends and I have been using it for a while now, it's great! Good job!

Its on F-Droid! Just installed it :D