sim-im is a simple and powerful multi-protocol instant messenger developed at http://sim-im.org/
Based on the Qt library it works on X11 (optional with KDE-support), MS Windows and MacOS X.
Some of the features:
Supported protocols: ICQ, Jabber, MSN, AIM, Yahoo!, Livejournal; Receiving and sending SMS; Server-side contact list; Receiving and the sending messages in RTF-format; Phone directory support; File transfers; Chat; Support Miranda icon themes; Spam filter; Secure direct connection with SIM and L-ICQ; GPG encryption using gnupg; Message or chat mode for user window; On-Screen display notification about messages and user status; Sending of the messages to several users; Proxy: HTTP/HTTPS, SOCKS4, SOCKS5.
These details are provided for information only. No information here is legal advice and should not be used as such.