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Chatter
Chatter - Enable easy sharing of smaller parts of your screen...
LibMSRP
Free and open source MSRP library written in C...
CatBot
Open source web-based chatterbot for your Mac...
BuddySpace
Free and open source Jabber Client for your Mac...
Imptalk
Free and open source Voice chat and collaboration software...
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Speak-Python
Python based application for instant messaging...
Zinc
Run Yahoo! chat from the Terminal...
The Telnet Chat Daemon
Free command-line telnet chat server...
InChat
AIR-based chat application that allows you to chat with users on the same LAN...
LarryMessenger
Simple to use, cross-platform instant messenger...
X-Chat Aqua
Uses the IRC engine from XChat and has been designed to look and feel like XChat...
iRCm
GUI-based Internet Relay Chat (IRC) Mobile for Apple iPhone....
KPC
Free and open source KScript portable communication utility...