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Adium
Adium is a free instant messaging application for Mac OS X, released under the GNU GPL and developed by the Adium team. With Adium, you can connect to any number of messaging accounts on any combination of supported messaging services and then chat with other people using those services.
Console utility intended for sending "net send" messages from command line within LAN. Sent is fully compatible with WinPopup and Windows NT Messenger Service (net send). Works in Windows 9x/NT/2000/XP/Vista.
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.
Messenger to call and talk over the Internet just like you`re on the phone. All you need is a headset, or a microphone and speakers. It`s that easy - just click the Call button. If no one`s there, leave a voicemail!
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.
OnLAN Messenger - Enterprise product - messaging service is a client-server multi-user application for instant messaging and file exchange (instant messenger).