Open Source Gaming
blog.minetest.net
I don't know how I feel about the name, but I think it is good that they moved away from minetest.
powdertoy.co.uk
Fun! Literal sandbox game!
unvanquished.net
It's been a while since I have played it, but when I did it was fun. It's hard to get a big enough group of friends to play.
Blast your enemies and your friends!
www.gamingonlinux.com
Looks interesting. I haven't tried it. Looks like you need to own a copy of the original game. I am sure you could probably find it on GOG.
Looking for a good roguelike? Give this one a try!
Or planning to play? For me, I am looking forward to some SS14 this weekend. https://spacestation14.com/
www.gamingonlinux.com
Looking at their GitHub, it appears to be open source, but I don't see it advertised anywhere. https://github.com/Inq8/CAmod
www.beyondallreason.info
If you haven't played it, it is a fun Real Time Strategy game!
No updates, just a really good remake of Transport Tycoon
spacestation14.com
If you haven't played a space station game before, it's a fun time. Try one of the Wizard's Den servers if you are new.
en.wikipedia.org
It's a 2d game that's like Doom apparently
