SuperTuxKart (STK) is a free Mario Kart clone which uses FOSS mascots (like Mozilla, Tux (from Linux) and Wilber (from GIMP) with more being made avaliable by fans) instead of Mario ones. The graphics are simple, but this is a good thing because it means that older computers can run the game on high-FPS with ease.
You can play with two players using split-screen and having two people on one keyboard. This is brilliant considering not many games these days allow one-PC multiplayer and this format means that you can invite friends round and they don’t need to bring a PC for you to play together. Online multiplayer was requested, but if they are to add it as a feature, they might have fully online multiplayer with central servers and everything (basically, we don’t know when it is coming, go code it yourself :P). This has been done in games like Hedgewars (FOS Worms).
STK is a very innovative game. Wiimote support was trialed by developers (very revolutionary if they manage to officially add it because it is on a PC and no other games that I have heard of have tried WII integration) and using OpenStreetMaps (FOS Google Maps), you can actually make races for STK out of real-life locations. They are also in the Google Summer of Code this year (2013), which means that students get paid by Google to code on the game. This should help add a few more features and get another release out soon.
Usability: 8/10 (Familiar to a Mario Kart player, but you’ll probably need to look up the controls in the settings and a tutorial would be nice for first-timers, but it supports external controllers well which is good)
Aesthetics: 7/10 (OK, they’re pretty shoddy as graphics goes these days but very good for a FOS game and very cartoonish so suitable for all the family)
Performance: 9/10 (Very, very fast although it can occasionally feel a little laggy for a game that has such low graphics)
Overall: 8/10 (Solid, child-friendly game that can provide hours of fun and has a lot of potential)
Written by Adam.