8bitMMO is a free MMO with a...well, you can probably guess what the artstyle is from the name alone. With a tile based freeform construction system, support for PVP battles, and loads of Lawyercats for you to fight, I reckon 8BitMMO is worth a look, especially if you've got any nostalgia for games from the 1980s.

The developer, Robby Zinchak, describes the current build as "Fully playable", but is still adding new features and content on a regular basis.

It's playable in a browser right here, and you can find more information and get updates over at the 8BitMMO blog.