SuperTuxKart 1.4 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This free program is an intellectual property of STK Development Team.
The most popular versions among the program users are 0.9, 0.8 and 0.7. The software lies within Games, more precisely Racing. We recommend checking the downloaded files with any free antivirus. The program's installer is commonly called supertuxkart.exe.
From the developer:
SuperTuxKart is a Free 3D kart racing game, with many tracks, characters and items for you to try. You can play with up to 4 friends on one PC, racing against each other or just try to beat the computer (a network multiplayer feature is planned). See the great lighthouse or drive through the sand and visit the pyramids. Race underground or in space, watching the stars passing by.
You may want to check out more software, such as Race On, Rollcage Redux or F1 2016, which might be similar to SuperTuxKart.