Well I know lots:
Meez.com
Allgirlarcade.com
Webkinz.com(You need a stuffed animal to get the code or buy online)
Pixiehollow,com
Wizard101.com
Clubpenguin.com
Fantage.com
Barbiegirls.com
Habbo.com
Imvu.com
Runscape.com
Starpets.com
Tygirls.com
Onlinelife.com
Dizzywood.com
WHEW! That's a mouth full. Anyways, enjoy playing them!
Guys NO ONE IN THIS SITE will give you free membership or real codes. Oh gee..here is an idea or a few.BUY THE FRIGGEN MEMBERSHIP.BUY THE TOYS FOR THE CODES.BUY THE CHARM BOXES OR WHATEVER.If you can't, then get a bff or bffl with lots of code items AND ASK HER/HIM THE CODES.