I’d like to see more, but the only ones that I know of are red eclipse (kind of like halo), 0AD (kind of like age of empires), and minetest (Minecraft but really made so that each server can have any number of ridiculous difference in gameplay because of mods).
Oh, OK. So this is more like the “potential “for more games to be created on a sort of platform. I was just expecting to see a list. Thanks for clarifying. 
No, there is a list: https://lemmygrad.ml/comment/2278718
This is just an open source engine for the classic Command & Conquer games. You need to supply discs/isos to be able to play the games fully–similar to open source ports like GZDoom/PrBoom for Doom/Quake/etc. and OpenMW for The Elder Scrolls III: Morrowind.
Here’s a start:
- https://wikipedia.org/wiki/List_of_game_engine_recreations
- https://wikipedia.org/wiki/List_of_open-source_video_games
- https://github.com/radek-sprta/awesome-game-remakes
- https://github.com/michelpereira/awesome-open-source-games
- https://github.com/leereilly/games
- Updated Version: https://github.com/Yaksinikos/games
I mentioned some games on Lemmygrad a few months ago:
