SvenCo-op 2.1 has been released! This release has quashed a lot of bugs that plauged prior releases, and added a lot of small new features, a new weapon, and some new monsters.
What is Sven Co-op?
Sven Co-op is a Co-operative modification for Valve"s genre-defining game Half-Life. In this modification, you are not fighting against other players -- they are your allies, and you need to work with them to overcome large numbers of AI-controlled enemies.
This is a mod for Half-Life, a copy of HL is needed to play.