D2EX is a Diablo II: Lord of Destruction tool that provides various miscellaneous features such as:
- Enables multiple concurrent instances of the game to be run.
- Allows you to configure the CD key set used for Battle.net, allowing for multiple connections.
- Improves the responsiveness of multiplayer
- Supports file-system redirection, allowing for easier installation of mods (data only)
- Chat message logging and regex-based chat filtering
- DirectDraw emulation (1.13 and earlier)
- Instantaneous joining of local multiplayer games (Open Battle.net and "TCP/IP")
- Easily configure additional gateways for private Battle.net servers
- Enables the usage of unsupported client versions on private Battle.net servers
D2EX is non-destructive; it does not modify, replace or otherwise result in any persistent changes to your game installation or system.
You may also be interested in BNS -- a website which provides real-time information about Diablo II games currently on Battle.net