If you like the game console (The original one), we've been hosting it quite a bit to bring it back to popularity. It's a really nice game, and it's my new favorite game. Just what I need though, another game to give me an addiction to BYOND.
Anyway, the hub address is here.
The game basically emulates a command-line atmosphere, but there is so much more to do. You can program scripts in the PCs, change the passwords to the doors, share your products, create a new internet, make an OS, etc...
It's really enjoyable once you get into it. For some useful knowledge about the game, go here.