Systems Software Engineer and Private Pilot (tailwheel, complex, high-performance and aerobatics).
Windows 10 SDKs: handy collection of mostly the include files (and some debugger stuff) for Windows 10 DDKs/SDKs.
CUDA Samples: all the code samples that ship with each CUDA version.
Agner: collection of Agner Fog's tools that I try and keep up-to-date.
Fonts: TrueType fonts I like using on Windows, especially Monaco.
Wallpapers: collection of desktop wallpapers I've accumulated over the years.