Shit, now I've gotta give this a try for research

It's RMC14 (or just RMC) and it's a fork hosted by one of the core staff of SS14. It's a REAAALLLYYYY tight experience that somehow scales fantastically for even up to 200ish players, as marines fight with xenos (with each side having a solid variety in roles/functions). Gooooooood stuff!