I'm working on an open source game engine contribution: data-oriented text styling with a custom markup language! It's been in the works for a big part of last year, but for a sufficient number of reasons (such as significant upstream changes) I decided to totally re-architect the underpinnings while keeping the overall design/interface and do a chunk every day to complete it on time. Normally I wouldn't want to re-work something like this when it's "so close" but it's actually blowing by quickly since I surgically extract a lot of the old code and know exactly what I'm doing this time around. I only work on it while Twitch streaming to document my process and give the game engine some more public exposure. I'm having a lot of fun with it. :D
The game engine
My channel where you can view recent recordings or watch it live
My public fork/branch
Not so sparkly and interesting to look at yet since I'm still wrapping up the data model and parser, but it'll get there. Check them out if you feel so inclined.