Anything related to the game Command and Conquer Generals or the Zero Hour expansion.
Mostly individual units bodged together from other assets. Loose files, not packaged in .big archives, to make editing and inspecting quicker.
Things relating to the GZDoom engine.
Anything related to the game Supreme Commander or the standalone expansion Forged Alliance.
Some units and code examples. The only noticeable item which stands out is the WiSoTa project which adds dynamic, customisable, renewable energy sources.