Extreme Tux Racer is the best fork of the Tux Racer snow-hill racing came originally released in 2000. It features the Linux mascot Tux who's up on a mountain-top looking to race down. It was forked off in 2007 and last updated in 2018.
GLtron is a 3D light cycle version of the snake games who were popular in the early 1980s. Is is named after OpenGL and the movie Tron which inspired the game. It was originally released in 1999 and it has not changed all that much over the years. The graphics is simple and the gameplay is not at all exciting.
SuperTuxKart is a fun free kart racing game with online and LAN multiplayer modes as well as single-player story-mode, time trials, a soccer mode and Easter Egg hunt. It is a very entertaining and family-friendly game. SuperTuxKart is available for GNU/Linux, Haiku, Android, macOS, iOS and Windows.
TORCS is an old racing car game with acceptable graphics for a game originally developed in 1997. The controls and gameplay isn't ideal and it's not very fun at all. The name TORCS stands for "The Open Racing Car Simulator" and it's website describes it as an "AI racing game and as research platform". Perhaps the developers simply didn't focus on making it a fun game for human entertainment.
VDrift VDrift is supportedly a cross-platform drift racing game for Linux, *BSD, Windows and macOS. We are unable to verify if this information is or is not true. Many distributions have dropped VDrift and the distributions that do include it provide a binary which immediately crashes upon launch.