Track Mania is one of the greatest racing games ever created, featuring hundreds of tracks in a variation of styles. Another great feature is it's willingness to be modded. You can add cars, maps, music and so much more with ease. The community thrives on this and always strives to make something better, as do I. You'll find a list and links to the tracks and mods I've made so far.
Sand Land (24 Levels)