Bip is an IRC proxy that supports replaying logged conversation and multiple clients on one IRC server connection. It has a handy logging directory structure. It is multi-user and has a flexible configuration. Some of its configuration can be changed at runtime with special IRC commands.
Community Chat is a feature-rich, Flash-based Web chat application. It offers video/audio options as well as basic text chatting. It features multiple rooms, flexible video window positioning, personal settings, friend/block lists, complete integration with an existing users database. It also has features a whiteboard, instant messengers support, online games, an MP3 player, and more.
NakenBot is a bot for Naken Chat servers. It written in PHP and runs from the command line, with no Web server needed. It is a little information bot support for stocks, weather, word translation using Google translate, an 8-ball game, an uptime feature, the ability to add and search bookmarks, show the time by timezone, list users, and see who is online, and an admin password option that allows the admin to use the say command.