image: Unknown Horizon's multiplayer menu
There have been six updates on Unknown Horizon's blog this year alone and their latest is an invitation to a multiplayer gaming session.
Saturday, March 10, 16:00 GMT (convert to your time zone)
You will have to get and compile the development builds for Linux, Mac OS X or Windows but the guidelines are extensive and you can get real-time support via IRC, so don't let that intimidate you. :)
images: showing off Unknown Horizon's multiplayer chat