Chat
- Miranda : a modular system. It supports ICQ, MSN, Yahoo, IRC, Jabber. Journal Discussion
- Pidgin (formerly Gaim) : compatible with AIM (Oscar and TOC), ICQ, MSN Messenger, Yahoo, IRC, Jabber, Gadu-Gadu and Zephyr
- aMSN : MSN Messenger clone
- Trillian : supports AIM, ICQ, MSN, Yahoo.
- VIRC : IRC client
- Kvirc : IRC client