A self-building C compiler for x86 and x86_64 architectures. There is also a MIPS fork on GitHub.
Worked on some of the networking infrastructure in Unreal Engine 3, which went into Gears of War 2, and my Big Screen Gaming project.
Contributed a large rewrite of the way joypads/joysticks were handled in ZSNES, which was accepted into the project and used for many years.
Miscellaneous contributions like window snapping, optimization, and documentation improvements.
Ported the first seventeen NeHe OpenGL lessons to SkyOS.