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I've been enjoying and contributing patches to Beyond All Reason, which traces its inspiration back to the Total Annihilation real time strategy game.

It's truly incredible what a community can achieve over the course of ~20 years of open-source contributions.

BAR is a surprisingly good game

OpenRA (Command & Conquer), CorsixTH (Theme Hospital), ET: Legacy (Wolfenstein: Enemy Territory) and FreeCiv (Civilization) are the examples I have spent the most time playing. I know there are others targeting games like Age of Empires and Heroes of Might and Magic but I haven't played them and I'm not sure if they are as mature.

VCMI (the Heroes of Might and Magic 3 one) is amazing!

https://osgameclones.com

Also: https://freegamer.blogspot.com/

There's a whole lot! Here's a list I found: https://github.com/radek-sprta/awesome-game-remakes

Widelands is based on/inspired by Settlers II.