Online massively multiplayer (browser-based) soccer and racing games?

I am you do a little investigate on massively multiplayer soccer and racing games. I am usually meddlesome in those which suggest a browser formed knowledge (no need to download a game customer on your computer). Both free and reward services. In any country/language. I am meddlesome in links to these sites and if you have experience, a really short dual line examination of the game/site. Thanks!