I'm mostly on RPG.stackexchange.com, but also check Sci-Fi/Fantasy and Stackoverflow. I'm currently GMing and/or playing OD&D, AD&D 2e and Stars Without Number campaigns. I use C# (in Unity3d) and Python when writing code.
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Q&A for science fiction and fantasy enthusiasts
Q&A for professional and enthusiast programmers
Q&A for serious players and enthusiasts of chess
Q&A for passionate videogamers on all platforms
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games