A list of ten really neat non-profit source ports and engine recreations/upgrades from the community. As always, it's ten that I've played about with extensively, so there are notable omissions. (sorry OpenMW!).
List of ports (by order of appearance in footage):
OpenMW: https://openmw.org/en/
xGreed: https://github.com/jval1972/xGreed
Quake Kex Port (commercial): https://store.steampowered.com/app/23...
Command & Conquer Remastered (commercial): https://store.steampowered.com/app/12...
Outcast 1.1 (commercial): https://store.steampowered.com/app/33...
OpenRA: https://www.openra.net/
LAB3D/SDL: https://icculus.org/LAB3D/
ECWolf: http://maniacsvault.net/ecwolf/
Newdark: Le Corbeau has no official site.
CorsixTH: https://corsixth.com/
Raze: https://github.com/coelckers/Raze/
EDuke32: https://www.eduke32.com/
Daggerfall Unity: https://www.dfworkshop.net/
GzDoom: https://www.zdoom.org/downloads
Freespace Open: https://www.hard-light.net/
Freespace Source Code Project: http://scp.indiegames.us/
Feespace Port: https://fsport.hard-light.net/website/
OpenTTD: https://www.openttd.org/
ScummVM: https://www.scummvm.org/