JC2-MP is a project to bring multiplayer to Just Cause 2 in all of its magnificent glory. Imagine the chaos of normal Just Cause 2, then extending it out to dozens, hundreds, and even thousands of players.
This is just something that needed to happen, my cousin and I discussed this at length way back when I first got Just Cause 2. and now this is a thing. Damn I love PC gaming. Thank you devs.