http://github.com/MDamien/publicdb : Create datasets and have an (ugly) API. The goal was for everyone to create a database on almost anything (recipes, photos, party, budgeting). Later I discovered that it's what firebase/parse are doing. But I'm happy with my solution because you don't even have to use JSON to store you things and the interface is really simple.
http://kioto.io/ : Would be cool if any group could have an anonymous "suggestion box" ? Maybe! So I made this. But at the end I'm gonna do better a online discussion system based on ideas from reddit/discourse/disqus.
https://github.com/MDamien/GifMyLife : Just an app to take of photo of you at regular intervals and then it makes a timelapse GIF of that (good to see how your face and your mood evolves with time).
Really nice idea from OP, people are posting really interesting stuff