The popular Just Cause 2 Multiplayer mod has received a significant update, overhauling the main menu, adding Steam Achievements and a lot more.
The update, version 0.2, is in public beta and adds new features as well as fixes a lot of bugs. New features include being able to script NPC characters and render inside the world. Examples of usable scripts on the mod's website include those for the wingsuit, for companions, for claymore mines and more. It sounds like there's been a lot of work done to improving server and client communication and performance too. There's a full list of changes on that website.
If you want to help test version 0.2 before it's generally released, opt in to the public beta branch on Steam's Betas tab. "Do not switch to this branch unless you are willing to actively help find issues and prepare your scripts for the release," the team warned. "If you don't know how to switch to the branch, we advise you wait for the official release." If you do switch, you won't be able to use servers running mod version 0.1.5. To switch back, opt out of betas again.
"For everyone else," the team added, "don't fret; we'll have the final version out for your enjoyment once we've worked out all the kinks."
The Just Cause 2 Multiplayer mod came out at the end of 2013 with the noble aim of bringing multiplayer to the slapstick open-world of Just Cause 2 (the very same open-world Christian Donlan was praising just yesterday). "Imagine the chaos of normal Just Cause 2, then extending it out to dozens, hundreds, and even thousands of players," is the mod pitch on Steam. Note that you need Just Cause 2 game in order to play the mod.