Vault-Tec Multiplayer Mod ("vaultmp") is a multiplayer mod for the PCversions of Bethesda's award-winning role-playing games Fallout 3 and Fallout: New Vegas.

It's currently in development, but is going to
support the following:

Dedicated server, MasterServer and client including a server browser
Syncing of movement, actions / animations and AI
In-game GUI overlay for chatting
Supporting DLCs as well as Fallout user mods
Scripting on the server to define gameplay rules (PAWN and C#)

The main goal is to enable players to roam the open world of the wasteland /
the desert and experience all the exciting features of the games
together online. Systems which are inherently incompatible with a
multiplayer environment like VATS will be disabled. Furthermore quests
and missions will be removed at first. We aim to implement several of
them in future development stages though.

Want to join the team:

From: http://www.vaultmp.com/announcement.php?f=8

Vault-Tec Multiplayer Mod is a rather huge project and I would be grateful if it had some more developers. Work on vaultmp can be exciting and very diverse. It deals with the game engine (low-level), networking code, scripting and various design patterns. Most parts aren't easy to understand so you are required to have some well established C++ knowledge. However, I'm happy to answer any question regarding the source code!

If you are interested, write me a mail (recycler@vaultmp.com).

The source code is available here: http://github.com/Recycler1993/Vault-Tec-Multiplayer-Mod

http://www.vaultmp.com/