Blink is an SIP (Session Initiation Protocol) client for Mac that can be used with any SIP provider or on its own as a fully-featured SIP service.
Empathy is a messaging program which supports text, voice, and video chat and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.
Ekiga (formely known as GnomeMeeting) is an open source SoftPhone, Video Conferencing and Instant Messenger application over the Internet.
Dimdim is an open source web meeting product with features like Application, Desktop and Presentation sharing with A/V streaming and chat. No attendee installation – all features are available through a web browser. Dimdim can be integrated with Moodle.
WebHuddle is a simple, small, secure web conferencing on any platform that supports Java.
Colloquy is an advanced IRC, SILC & ICB client for Mac which adheres to OS X interface conventions. Colloquy has the look and feel of a quality Mac application.
KMess is a client to connect to the Microsoft MSN network, allowing you to chat with Windows Live Messenger users. It supports fast file transfers, display pictures, custom emoticons, and more.
Asterisk is the world’s leading open source telephony engine and tool kit. Offering flexibility unheard of in the world of proprietary communications, Asterisk empowers developers and integrators to create advanced communication solutions.
Mercury IM is a cross-browser Java MSN Messenger client. It is lightweight and customisable.
aMSN is an open source MSN Messenger clone, with features such as: display pictures, custom emoticons, multi language, webcam support, full-speed file transfer, chat logs, conferencing support, event alarms and more.
Adium is an instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.
Miranda IM is an open-source multi protocol instant messenger client for Microsoft Windows. Designed to be resource efficient with a rich feature set, Miranda supports AIM, Jabber, ICQ, IRC, MSN, Yahoo and more.
Pidgin is a multi-protocol Instant Messaging client that allows you to use all of your IM accounts at once. It works with the following: AIM, IRC, Yahoo!, MSN, MyspaceIM, ICQ, Zephyr and more.
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