err is a plugin-based XMPP chatbot designed to be easily deployable, extensible, and maintainable. It is written in Python, and is based on jabberbot and yapsy with some minor modifications to the first one. It has been tested with HipChat and Openfire, but should be compatible with any XMPP/Jabber servers. It can be set up so that a restricted list of persons have administration rights. Dynamic plugin architecture: the bot admin can install/uninstall/enable/disable plugins dynamically just by chatting with the bot. Supports MUCs (chatrooms). Can proxy and route one to one messages to MUC so it can enable simpler XMPP notifiers to be MUC compatible (such as the Jira XMPP notifier). It is easily extensible. It provides an an automatic persistence store per plugin, and a !help command that dynamically generates the documentation from the Python docstrings of the commands. Create a user for the bot on your private XMPP server or a public server like jabber.org. Optionally, you can create a MUC (also called a conference room or chatroom) in which you can interact with the bot.
Synovel Collabsuite provides email, calendaring, and instant messaging solution for enterprises. It consists of a Linux email server with calendar and IM, a Web-based administration panel, a desktop client suite that runs on Windows and Linux, and AJAX-based Web mail access. It uses open standards for communications: IMAP, POP, and SMTP for email, CalDav for calendaring, and Jabber for IM.
JTelIRC is an advanced IRC framework for Java. It is mainly intended for writing automated clients ("bots"), but may be used for normal clients as well. It provides an intuitive and well documented Java interface to IRC and makes it extremely easy to write advanced clients quickly.
Funpidgin is a modified version of the Pidgin instant messenger application. It was made in response to the controversial auto-resizing textbox that was implemented in Pidgin. Current features of Funpidgin include manual resizing and the ability to turn off persistent window placement. Funpidgin's releases are meant to coincide with Pidgin's releases.
MudMagic Mud Client is a GTK/GNOME multi-platform MUD client. It provides aliases, triggers, multiple connections, plugins, MCCP, ZMP, MSP, tabbed sessions, ANSI color, and a game list that can be updated from mudmagic.com. It is configurable on a per-session basis. Plugins include an automapper, database, and note pad.