Instant Messaging
Add-on Software, ActiveBuddy, ActivePager, AniazPOPUP, Arliweb Messaging Platform, Bantu, BattleCom, Centericq, Cop2p, Duisoft, Easy Message
IRC
Bots, Bouncers, Help, Java, mIRC, pIRCh, Scripts, Visual IRC, .IRC, Bersirc, BitchX, Blackened, CGI:IRC, dIRC, EPIC, ERC, Ghoti, HydraIRC
Java
BabelChat, Babylon Java Chat, Chat Blazer, Dialogoo, DigiChat, Internet Chat Systems, Inc., Java Chat, NetDIVE SiteSticky, NetDive WeMessage, okCHAT
Microsoft Comic Chat
# Comic Circus, Botender's #Comic_Chat_Lair, FurFire Comic Chat Characters, IRCX City Chat Services, Kewpie's Character Realm, Mermaid Elizabeth's Comic Chat Resources, Phoenix Online, Saturn Of Time
Telephony
Conflab.com, PalTalk.com, SharpVoice, SipTelecom, Skype, Versadial, Visitalk.com, Vitez Multimedia Solutions, VocalTec, WebPhone
Bombyx
Bombyx is a graphical client for SILC (Secure Internet Live Conferencing). It is written in C++ and uses FLTK as the widget set, plus a few other libraries.
Chatterbox
Voice chat software, good for online training, seminars, or communities, including text, voice chat, co-browsing and application sharing.
Comms4free
Lists only freeware or ad-ware communications software, including text chat, voice chat, and video chat. Descriptions provided.
CustomChat Inc.
Provides all the tools necessary to implement your own customizable, branded, web-based, multimedia and ecommerce enabled conference rooms on a web site.
Lister Smart
A sleek and useful solution that is set to change the perception of SMS as a communication tool.
Milc
A SILC Client for Windows, Linux/*BSD, and Mac OS/X. Has integrated public/private key support, OS standards interface, and HTML rendered output.
Stealth Chat
Freeware program that includes strong encryption and stealth measures. Ideal for office workers.
Wander
By dragging the address or link in a browser to this software, you can publicly or privately talk to other users reading the same webpage.