SIM-IM (SIM Instant Messenger) is a free software package licensed under the GNU General Public License (GPL). SIM provides a plugins-based instant messenger with support for various protocols. Based on the Qt library (with optional KDE support) SIM-IM works on most operating systems.

All protocols support richtext-messages, file transfer, typing notification, server-side contact list (with postponed synchronization - you can change contact list in offline mode and after log on all changes will be synchronized with server), new account registration, various searches and HTTP-polling.

You can use multiple accounts for each protocol: ICQ, AIM, Jabber, LiveJournal, MSN and Yahoo!