Adium

InspIRCd is a modular C++ IRCd (IRC daemon) for Linux, BSD, Windows and Apple OS X systems created to provide a stable, modern, and lightweight IRCd written from scratch.

Private Tracker Pro tracks the user`s current location and logs the locations that the user has visited into a hidden log file. Best of all, Private Tracker Pro runs in a discrete manner, and the users are not aware that they are tracked.

OnLAN Messenger - Enterprise product - messaging service is a client-server multi-user application for instant messaging and file exchange (instant messenger).

A fully featured, stand-alone, skinnable chat client that supports AIM, ICQ, MSN, Yahoo Messenger, and IRC. It provides capabilities not possible with original network clients, while supporting standard features such as audio chat, file transfers.

Vphonet is a SIP based VoIP softphone. Offers free calling between computers and low-cost calling to regular telephones. Video conferences, video e-malis, calls forwarding, voice mail, SMS worldwilde, file transfer, chat are also available.