Cataclysm: Dark Days Ahead is pretty astounding, offering an incredible level of detail and degree of freedom, plus just lots of zombies to fight.
Free and Open Source Software
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- Asuna
- Lord of the Test
- 0 A.D.
- Xbill
- SuperTuxKart
- Sonic Robo Blast
- The various Doom mods
- Konquest
- SuperTux
- Endless Sky
Another shout-out for Sonic Robo Blast! I absolutely love that game.
Cataclysm DDA is amazing if you are into this stuff.
I really like MineClone2 (a Minetest game).
Crack Attack! is a loving parody of addictive tetrislike games that is also an extremely addictive tetrislike game.
Definitely Neverball. My kids and I spent so many hours in it.
OpenTTD is good, so is TuxKart, but both have better closed-source alternatives. I don't think Neverball does.
Lix – https://www.lixgame.com/
FOSS Lemmings, with many great features (like multiplayer) and active development.