Yourbot IRC Bot
- IRC bot for windows with games, personality, and channel administration.
- http://www.ybbot.com

Supybot
- A flexible and extensible IRC bot written in Python.
- http://supybot.com/

Channel Manager
- Based on eggdrop. Designed to improve stability, security and functionality.
- http://www.vwe.net/chanman/

Perl-fu2
- Perl IRC bot that has learning capabilities and maintains a facts database
- http://android18.slim.summitmedia.co.uk/perl-fu2.html

PipSqueek
- IRC bot written in Perl and mySQL.
- http://pipsqueek.net/

Markov
- IRC chatterbot which imitates other chatters by analysing old chatlogs, looking at frequencies of character patterns. Answers are mostly nonsense, sometimes relevant.
- http://www.cteu.de/markov/

Acrobot IRC bot
- Written in PERL language. It is a kernel, acrobot.pl, that manages the connections, and some modules.
- http://savannah.nongnu.org/projects/acrobot/

Flooterbuck Infobot
- A rewrite of Kevin Lenzo's Infobot.
- http://flooterbuck.sourceforge.net/

BlootBot
- Perl bot descended from Infobot. In active development.
- http://blootbot.sourceforge.net/

Garnaxbot
- Fileserving and channel protection bot written in C.
- http://garnax.mircx.com/

Dancer
- Open source IRC bot. Developed in C and runs on most UNIX flavors, Win32 and AmigaOS.
- http://dancer.sourceforge.net

iroffer-Lamm
- An advanced version of PMG's IRC-Fileserver-Bot.
- http://iroffer-lamm.sourceforge.net/

Eclipse Daemon
- An advanced bot written in C for UNIX.
- http://www.eclipsed.org/

Sharp Egg
- IRC bot written in C#. Currently in alpha stages.
- http://sourceforge.net/projects/sharpegg/

LeftEgg IRC robot
- Tarball downloads of the UNIX IRC bot.
- http://www.paco.net/~ejs/leftegg

PircBot - Java IRC Bot Framework
- Allows you to create your own custom IRC bots quickly and easily.
- http://www.jibble.org/pircbot.php

Plum IRC bot
- Open-source modular IRC automation in Java with javadoced API.
- http://www.mauvesoft.co.uk/plum/

Programming IRC Bots in Perl
- Offers an introduction and extensive documentation on creating bots written in perl.
- http://www.wholok.com/irc/

oer and oer+MySQL
- A portable and compact IRC bot written in C
- http://oer.equnet.org

Lisp IRC Bots
- IRC bots written in Lisp.
- http://www.cliki.net/Lisp%20IRC%20Bots

Acidblood
- Open source IRC bot for Unix.
- http://acidblood.sourceforge.net/

bitchbot - perl based IRC bot
- News, features, download area, command reference, installation instructions, and configuration guidance.
- http://www.r1ch.net/projects/bitchbot/

Infobot Homepage
- Written in perl, stores and provides information about IRC users.
- http://www.infobot.org

IRCbot
- An IRC poker dealing program.
- http://www.cs.cmu.edu/afs/cs/user/mummert/public/www/ircbot.html

EnergyMech
- Open source IRC bot written in C. Includes many useful features.
- http://www.energymech.net/