It's taken 2 decades to appear, but this fan-made spiritual successor to Command & Conquer: Renegade has finally hit 1.0: '12 years of beta testing has led us to this'

Renegade, mastered.

PC Gamer

For some reason I thought this was going to be an open-source community effort, but it’s not. It’s proprietary and made by an indie studio called Totem Arts.

Disappointing.

yah, 12 years of cooking is crazy for it not to be.
Curious as I am not aware myself, what are some good open source games out there?

Xonotic (arena shooter), 0 A.D. and Beyond All Reason (RTS), OpenTTD and OpenRCT2 (management sim), VVVVVV (platformer).

These are the one I’ve tried, out of all of them VVVVVV is probably the most polished since it was a commercial project that later got open sourced. BAR is pretty good too if you like over the top RTS games. TTD and RCT2 are reimplementations of the original games. I don’t have strong feelings towards Xonotic but arena shooters aren’t my thing so 🤷‍♂️