Ainebot is artificial intelligence chatbot software. It contains a language interpreter which allows you to easy create your own bot personality, and ready-to-use personality files. It works as a CGI (for Web pages), a command line program, a GUI window, and an IRC (eggdrop) bot. It is based on A.L.I.C.E. and Annabot.

PVD Tusa Chat is a highly productive web server for online and offline dialog. It is a kind of mini portal which includes web chat, forum, local mail and many other things. IRC Modules QUIZ Modules Mafia Modules

Yacca is an advanced chat bot (other plugins are under development, including a command-line only version for you to interact with yacca) that is designed to resemble a human chatter as closely as possible.

VisualMessenger is a web-based instant messaging software that allows users connected to your site to have real-time conversations and send files between them. VisualMessenger dramatically expands the functionality of the web by allowing real-time, two-way communication between your users or employees without special plug-ins or client-side software.

WebConference Chat Server is a full-featured streaming chat server with non-java web clients providing the same, fast chat capabilities as other solutions only compatible with nearly any web browser. WebConference Chat Server features a sleek, customizable interface, many advanced operator and security tools, a full 16-million color mixing palette, the ability to upload pictures directly from your desktop, an image approval system, GUI configuration management, and much more. Includes streaming support for Macintosh.

This is a CGI program written in C++ which implements a single-room chat (very simple but useful) for Win32 based web servers.