iGo Incognito
iGo Incognito - the most secure instant messaging system available. iGo Incognito provides encrypted instant messaging, private chats and open forums. The iGo Incognito network is built on a combination of public key encryption and the US Advanced Encryption Standard (AES). ... All chat messages are protected by 128 bit session keys swapped using public key techniques. ... You can create or join Chats are truly private - only invitees can join the group and read the messages being sent. ... You can also send/receive files - just drag/drop files and folder from the explorer onto a friend -...
http://www.igo-incognito.com/download/IGo-Incognito1.2.exe - 2Mb - Download - Screenshot

AIM PowerPlus
AIM PowerPlus enhances your AOL Instant Messenger with great new features and add-ons, these include powering up your AIM with 200 new free smileys, comprehensive chat conversation recording (full HTML with time tags, all colors and URLs preserved), exclusive Buddy Icon collector that can save... Easy to use and with a simple "point and click" interface for the additional 200 smileys that can be used from any AIM chat window, AIM PowerPlus is the ultimate add-on for AOL Instant Messenger.
http://www.adroz.com/PowerPlus-Setup.exe - 417Kb - Download - Screenshot

Axmate
MSN, Yahoo & ICQ multi IM with P2P search & download from Kazaa, edonkey & more . Many add-ons: fire transfer, sound effects, cool smilies, integration with IE (Internet Explorer) no spyware, fast downloads of mp3, movies. Get fresh news in chat. Nice interface with built in web and P2P search... If you are fund of the chat emotions, smiley based communications and many other interactivities online during the chat sessions then, Axmate is here 4 u! ... With Axmate you can save your chat, manage your windows with ease, use our enhanced emotions, smiley faces and icons, make use of our...
http://dl.filekicker.com/send/file/150629-1P80/axmatesetup.exe - 4Mb - Download - Screenshot

Chat Surveyor
Chat Surveyor is a handy network utility for capturing and observing chat conversations on all computers in a network. It can record conversations automatically in real time and export all intercepted messages to HTML files for later processing and analyzing. ... It's easy to use, and it will monitor all conversations in your LAN without the use of client software installed remotely.
http://www.inforazor.com/down/ChatSurveyor.exe - 3Mb - Download

LAN Voice Chat
This program is for phone alike voice chat in your local network. It's very cheap, small, simple and easy to use. You don't need to have a server in your network. Any network will be okay, no matter how small it is. We can also tailor it to your needs (from putting your company logo to... We're also open for developers who would like to integrate a voice chat with their applications.
http://www.softlakecity.com/downloads/LAN_Chat_setup.exe - 525Kb - Download - Screenshot

Chat Module - Dating Software
Allows users of the site to chat... to create private rooms, where they can discuss different problems or question in real-time..
http://www.alarit.com/downloads/products/dating.zip - 22Kb - Download - Screenshot

GCN
With E-mail, Chat Rooms, Private Messages, Games, a Web Browser, Popup-blocker, Profiles, Message Boards, Desktop Sharing, Integration with AIM, MSN, Yahoo, and ICQ, Voice Chat Rooms, Video Conferencing, Language Translation, File Transferring, Whiteboards, a Media Player, Free Web Hosting,... The best part is, GCN is and always will be absolutely FREE!
http://www.gcn.cx/gcn_setup2.9.1.exe - 3Mb - Download - Screenshot

Conqueror Chat
Build with compatibility in mind; this is one IRC client that will not disappoint. Unlike other IRC clients, Conqueror Chat was designed for both the novice and seasoned veterans in mind concentrating on chatting.
http://www.jasoncox.ca/CChat.exe - 2Mb - Download - Screenshot

Chat Module - Match service builder
Allows users of the site to chat... to create private rooms, where they can discuss different problems or question in real-time..
http://www.explorinform.com/downloads/products/dating.zip - 22Kb - Download

Instan-t
Instan-t is a powerful instant messaging software that allows you to communicate with MSN, AOL, Yahoo! , ICQ and Instan-t IM networks. Some Instan-t unique features are: - Voice chat: communicate face to face with contacts on any IM network and see their facial expressions. ... - Multi-network chat: establish a multi-person chat session where you can simultaneously chat with users from MSN, AOL, Yahoo! ... Instan-t has other user friendly functions such as the possibility of switching skins on your user interface and of seeing which contacts have you in their contact lists.
http://inidownload.com/it/Download/Completo/ITsetup.exe - 6Mb - Download - Screenshot