I've been tinkering on and off with my own programming language for the last couple of years: http://www.adama-lang.org/

The key motivation is dealing with the complexities of managing all the state between people as they play a game with a strong boundary for privacy.

I am debating what my next steps are with what I've learned. Do I focus on growing things around it, or do I abandon yet another project and do something that might actually achieve success.