Enhanced Coop Info
ECoop's main goal is to add coop support to all the valuable Single Player campaigns that have been released for Unreal Tournament since its existence, while maintaining the campaign's original experience as much as possible and without modifying any content.
It also hasn't been made public yet, because it's in constant development, and I don't want version mismatches.
If you have Unreal Tournament (UT99 one), you can always Join one of Loathsome's ecoop servers and see what it's all about.
If you don't, you're doomed to play this Unreal Flash game meanwhile.
Or if you'd rather race a lap or two, go ahead.