ActiveBuddy: Provides software for developing and hosting interactive agents.
ActivePager: An instant messenger for local area networks enabling you to talk in real time to anybody on the same computer network. Offers Answering Machine, and Templates and Blacklist.
AniazPOPUP: Expands the concept of Windows messaging from the droplet created by winpopup to a new level.
Arliweb Messaging Platform: Arliweb XMP is an XML and web services based messaging service and software application.
Bantu: Offers a web-based solution to instant messaging that lets you talk to people with the AOL, MSN, YAHOO, and ICQ messangers.
BattleCom: A program that allows you to talk instead of type, a new way of chatting.
BigBlueBall.com: Instant messaging tutorials, reference, news and forums for AIM, MSN, Yahoo, ICQ, Trillian and other products.
Centericq: A text mode menu and window-driven IM interface that supports the ICQ2000, Yahoo!, AIM, MSN, and IRC protocols and has many other useful features.
Cop2p: This product encrypts all communications over the web. Other options include file sharing and chat.
Duisoft: Enterprise Instant Messaging (EIM) applications all featuring a dialog user interface and instant broadcast and response capabilities - providing means to extend enterprise applications to the mobile workforce and mobile consumer.
Easy Message: Free all in one instant messenger, including support for MSN Messenger, Yahoo Messenger, AOL Messenger, and ICQ Messenger.
EMSN Messenger: EMSN is a PHP-Messaging System.
Encrypted AIM: This addon encrypts instant messages for MSN Messenger, AOL Instant Messenger, and Yahoo Instant Messenger.
Endogy: Endogy provides Instant Messaging software and consulting services for the improvement of team workflow.
Gaim: A Linux/UNIX instant messenger client, which can handle multiple protocols, including AIM, ICQ, Yahoo!, Jabber, and Gadu-Gadu.
GlobalChat, Inc.: Offers system to send high priority message instantly to customers and associates.
Gtkmsn: A MSN protocol based client. Includes download section and screenshots.
Integrity Messenger: Messaging service that provides instant contact with Internet users, language filtered and family safe.
komunikator tlenplus: An extended Tlen client with emotes,skins, and plugins.
Kopete: Linux based, KDE specific, it is a flexible and extendable multiple protocol instant messenger.
Meca Messenger: Multi protocol Instant messenger with: multimedia integration, skins, SMS capabilities, logs, email viewing and offline messages.
Miranda Instant Messenger: A modular open-source multi-protocol instant messenger for Windows that maintains an extensive database of community developed plug-in's that add functionality.
naim: A console-based chat client for Linux/Unix-like systems, supporting the AIM, ICQ, IRC and Lily protocols.
OMS Online Messenger Service, SOAP Webservice: A webservice for creating one's own messenger client. Included is a webbased version of OMS.
OUGO Messenger: A Windows Messenger.
P2P Messenger .NET: A secure Instant Messaging client, working by Peer-to-Peer technology. It is fully decentralized and does not require any servers. Supports public-key cryptography. Requires installing .NET-Frameworks.
PKIChat Secure Instant Messaging: Secure instant messaging using auto generated public/private key pairs.
PowWow Messenger: A multi-functional instant messenger program. Including: Chat, Text to Speech engine, games, guestbook, and whitepages.
Rediff Bol: Allows user to chat, check mail, and search the web.
SimpleAIM: An open source miniature conosole based AIM client written in pure Java.
SphinXSoft: SphinXSoft M2 is an Instant Messenger that allows users to customize the look and feel to their needs.
Trillian: A chat client for Windows that allows you to simultaneously connect to AIM, ICQ, IRC, MSN and Yahoo! Messenger.
VSL LanToucher: Instant messaging software solutions for business and home text communications across private networks.
Winpopup LAN Messenger: A full-featured server-less instant messenger for Local Area Networks.
WinPopup.com: Windows popup messenger. Has the ability to transfer emoticons, and links.