Vault-Tec Multiplayer Mod ("VaultMP") is a multiplayer mod for the PC versions 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
• Server-side scripting to define gameplay rules

The main goal is to enable players to roam the open worlds of the wastelands and experience all the exciting features of the games online.