Most libre games will run just fine on 10-year-old hardware. But for
higher-end 3-D games like Xonotic or SuperTuxKart, you're of course going to
need something better. That's just a fact of life. And you can't always
sacrifice graphical quality for performance. There's a limit to how much you
can do that.
If you want some recommendations for good games that don't require
particularly good hardware, here are some recommendations:
Project: Starfighter
Alex the Allegator 4
Freedroid
Kobo Deluxe
Dopewars
Freeciv
Freedoom
LTris
LBreakout2
GNUjump
Pang Zero
Scavenger
FloboPuyo
Defendguin
Burgerspace
All of the KDE games
All of the GNOME games
There are a bunch more.
But if you have weak hardware, you're going to have to live with the fact
that games like Xonotic, SuperTuxKart, Minetest, OpenArena, and MegaGlest may
be out of the question.
