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Instant messaging (IM) technology is a type of online chat that offers real-time text transmission over the Internet.
IrcClients - clients for the IRC protocol
JabberClients - clients for the Jabber/XMPP protocol
There are many other alternatives:
Graphical:
https://screenshots.debian.net/package/Kopete
kopete : multi-protocol client
https://screenshots.debian.net/package/Kadu
kadu : Gadu-Gadu client
https://screenshots.debian.net/package/Psi
psi : Jabber client
https://screenshots.debian.net/package/Tkabber
tkabber : Tcl/Tk Jabber client
https://screenshots.debian.net/package/Thunderbird
thunderbird : An email client with Instant Messaging features
Text/console interface:
https://screenshots.debian.net/package/finch
finch : multi-protocol client
ToDo: include video/audio-conferencing software/servers
CategoryNetwork | CategorySoftware | CategoryDesktopApplication