My favorite project Stick Knights Online, a 2D Online Role-Playing Game with stick figures! I created this game with C++, SDL, and OpenGL. It uses a custom C++ linux game server and MySQL database.
I am having fun with my old project Stick Knights Online which can be found on the public github repository, since I have open-sourced the project. All are welcome to tinker with it, ask questions, and offer advice and changes.