Free Realms is one of the most-accessible MMOs ever made, targeted at everyone from young children to adults. It's free to play and features a unique mini-game progression system, aimed at tearing down the usual tediousness of modern MMOs.

Metaplace is a browser-based community of user-created virtual worlds that also serves as an online games platform. Metaplace gives you the tools you need to create just about anything your twisted head can conjure — from casual social lounges to games both basic and complex — all with an extremely flexible set of building tools. If you can surf the web, you can use Metaplace, and this level of powerful simplicity makes it one of the most attractive virtual world communities around.