Harkozynx 9
A 10 level sequel to Operation Wormwood, the first scenario designed from the ground up to be completed cooperatively. This one has been languishing on the creator's hard drive for years - it's finally being released to the public. It's not completely polished, but it's very playable. It also contains a passel of netmaps, some original, some Bungie's. This one should keep you busy for a while!