Also for Command & Conquer: http://openra.net (currently C&C (Tiberian Dawn), C&C: Red Alert, and Dune 2000 with Tiberian Sun on the way).
(I used to be the lead developer of Ares for several years, the amount of reverse-engineering and C++ voodoo involved was awesome.)
1: http://ares.strategy-x.com/
2: https://ares-developers.github.io/Ares-docs/bugfixes/type1/i...