I spend a lot of time playing KeeperFX. A group of enthusiasts are rebuilding Dungeon Keeper from the DLL (https://github.com/dkfans). It's super cool to report a bug or feature on the discord and then have it fixed a few hours afterwards. (https://discord.gg/TeUREpV6N3)
Another free software fan reincarnation is Beyond All Reason, spiritual successor to Total Annihilation... It is everything we ever wished Total Annihilation to be !
https://www.beyondallreason.info/
I spend a lot of time playing KeeperFX. A group of enthusiasts are rebuilding Dungeon Keeper from the DLL (https://github.com/dkfans). It's super cool to report a bug or feature on the discord and then have it fixed a few hours afterwards. (https://discord.gg/TeUREpV6N3)
There's of course also OpenRA https://www.openra.net