Nested commands, easy configuration, and an incredibly flexible and easy-to-use plugin system distinguish Supybot from other IRC bots. There simply isn't a more flexible or easier to use IRC bot!
Bot Sentry is a Pidgin (libpurple) plugin to prevent Instant Message (IM) spam. It allows you to ignore IMs unless the sender is in your Buddy List, the sender is in your Allow List, or the sender correctly answers a question you have predefined.
A lightweight, high-performance Internet Relay Chat server
IRCD-Hybrid is a lightweight, high-performance Internet Relay Chat server.
libircclient is a small but powerful library, which implements client-server IRC protocol. It has all features needed to create your own IRC client or bot, including multi-threading support, sync and async interfaces, CTCP/DCC support, colors, SSL connections and so on.
X-Chat Aqua is X-Chat with an Aqua interface for MacOS X. X-Chat Aqua uses the irc engine from X-Chat, and is designed to look and feel like the GTK+ front end.
LostIRC is a simple, lightweight IRC client for X11 written in C++ to run on Linux/BSD, the goal of the first stable version is to be simple and as much keyboard controlled as possible.
srvx IRC Services is a ground-up implementation of services for IRC networks (supporting IRCu2.10, Bahamut, and other IRC server dialects). Features include POSIX threading, generalized proxy detection and all the standard services users expect.
A pidgin plugin that allows user to assign global hotkeys (e.g. Ctrl+Alt+g) for togglling buddy list and reading queued message. When "Toggle List" hotkey is enabled, it makes the buddy list hidden from your taskbar and task switcher (similar to ICQ).
Anope Services are built off of the original Epona code written by Lara which is built off of IRC Services. These services have advanced the original Epona code and include new features such as Modules, Mysql, and Defcon Mode.
dxirc is simple IRC client
Fire is a multi-protocol instant messenger client for Mac OS X based on freely available libraries for each service. Currently Fire handles AOL Instant Messenger®, ICQ®, MSN® Messenger, Jabber, limited IRC, Yahoo!®, and Apple Bonjour communications.
The IRC's Talking Robot
[ Please read https://sourceforge.net/p/darkbot/news/2014/01/darkbots-revitalization/ ] Darkbot is a portable IRC chat robot written in the C language that can be taught responses to user inquiries, and even have conversations with them. Darkbot was originally created by Jason Hamilton as an aid for help channels on Intenet Relay Chat.
UnrealIRCd is an IRC server based on the branch of IRCu called Dreamforge, formerly used by the DALnet IRC Network. Since development started on it (around May 1999) many new features has been added, modified, and many bugs fixed. Unreal runs both on *nix
Written entirely in Actionscript 3, aIRC is an open source Internet Relay Chat (IRC) client allowing users to connect to any IRC server through the Adobe Flash 9+ Player.
An IRC client that uses Tcl for not only the scripting, but also the "glue" at the C level for how all the parts of the application fit together.
A modern, minimalist, extensible chat bot.
NOTICE: We're not on SourceForge anymore. See http://autoproj.org for our new domain. Auto is modern, simple, and smart automated bot software, designed per a philosophy of minimalism, simplicity, usability, cleanliness, and easy extensibility. It has support for IRC (v3.1) with planned support for XMPP. It can be easily extended by means of its plugin API, and offers a host of features. It is known to function on any OS on which Ruby 1.9 functions (such as Linux, Mac OS X, BSD, Microsoft Windows, etc.).
The Invisible IRC Project (IIP) is an anonymous & secure IRC network.
SimpleXDCC is an intuitive xdcc download manager. It lets you simply join a desired server/channel and begin making xdcc bot requests. Ideal for people who wish to download multiple files without having to type a lot of xdcc send commands.
psyBNC is an easy-to-use, multi-user, permanent IRC-Bouncer with many features. Some of its features include symmetric ciphering of talk and connections (Blowfish and IDEA) It compiles on Linux, FreeBSD, SunOs and Solaris.
A fork of pidgin which aims to provide minor features that have not been addressed by the pidgin development team (including manual textbox resizing). See funpidgin.sf.net for details.
IRC Services with Live MySQL support (only running with a MySQL5.0 Server or higher), orion also supports modules and defcon (and many more features), it also includes a webinterface. Commands are based on Anope-syntax
IRClib is pure Java 1.2 IRC implementation. The IRClib library is designed very cleanly, supports RFC1459 and supports SSL connections. moepII is a Java IRC client program.
PlanetaMessenger.org is a Instant Messenger with support to all well known instant messenger networks including ICQ,MSN,AIM,Yahoo! and Jabber through a powerfull plugin engine. PlanetaMessenger.org support multiples look and feels, plugins and profiles.
Ayttm is an instant messenger program, supporting various protocols such as MSN, Yahoo, AIM, Jabber, and more. It is the heir of the Everybuddy project, and aims to continue improving the program and addressing its shortcomings.
Riggy is a dice `bot for pbIRC RPGs. He is specialized to provide a fair interface for D&D, d20, GURPS, White Wolf, Shadowrun and Mirima Tyalie dice systems. He also includes random name generation and miscellaneous IRC utilities.