OpenTTD

Probably the best retro transport sim ever

Teeworlds

Fast paced platformer shooter with grappling hooks

Fistful of Frags

Fun and quirky old western shooter

Command & Conquer: Tiberian Sun

A Timeless RTS Gem Now Available for Free!

Xonotic

Fast paced fun futuristic arena first-person shooter

Altitude

When is a platform game not a platform game? When it has Altitude

SuperTuxKart

Race through fantastical worlds with a cast of quirky characters

EVE Online

A space adventure like no other!