Does anyone know any MMO games what are reasonably low in size? I already know most of the FPS such as cube and COD but I'm looking for more retro styled games such as Terraria and such.. Being free would be preferable.
The only one that I know is NEStalgia. It takes some elements from modern MMOs (multiplayer, auction house, etc.) and infuses them into a retro styled environment. Also, it's free, so it fits perfectly to what you desire.
Best bit is that you can get everything in-game without ever spending a dime. If anything, spending money just makes the process faster. You see, you can trade in-game currency for the other currency, Crystal energy.