Are you aware of any interesting code-related projects like wakatime that can bring a bit of inspiration? I've lost my passion and looking for something to return me on a programming curve.

maybe you try a more visualy design related aspect of coding? like digital art with processing / p5 and motion detection, vvvv, projection mapping with madhatter, data visualisation with d3, 3D stuff with three.js or unity, virtual reality... just something rewarding that you can show even non devs and get a smile back. :)

Try to do something, big or small, each day. Never miss one day. Trick is to not have any ambition of the result, just do something. It doesn't matter if it's only 10 minutes, open your dev environment up at least once. I did this when I was in a slump. Some days I more or less only touched a README in Github, but after a few days lots of ideas and things I wanted to learn came to me :)