article: Pidgin (software)
links: Extensible Messaging and Presence Protocol Auburn University C (programming language) AOL Instant Messenger AOL Perl Python (programming language) Linux Yahoo! Protocol (computing) Jabber GNU General Public License April 8 Google Talk Windows Live Messenger Tcl April 6 C Sharp (programming language) 2007 Microsoft Windows April 22 Internet Relay Chat May 3 Instant messaging ICQ Cross-platform