Trivex is a open-source IRC bot coded in Visual C#.
This is a modification of the Markovsky IRC Bot. Extra code has been added so that the bot has the capability to not only speak in the distinctive dialects of Andrew Hussie's Homestuck Trolls, but can also switch between them at runtime.
VooDoo cIRCle is modular IRC bot, scriptable thanks to PHP and Perl, with built-in SSL support, File System, private BotNet and advanced security rights for each user. Runs on POSIX/Unices, Windows and Mac OS X.
a&a - tcl script for eggdrop/windrop
a&a - tcl script for eggdrop/windrop @ http://ascript.info & http://bots.land, used for creating bots on IRC, botlending activity and/or just fun.
dxirc is simple IRC client
efirc is an easy, small and fast internet relay chat client. efirc is secondly intended to be configured by companies or normal people which have an irc-channel to fit the clients design the companies one and to preset the irc connection data.
A little Service set for TS6 IRCd Servers (like InspIRCd 1.2)
gircd is an lightweight IRC Daemon
A modular utility script for mIRC with its own native theme system, support for multiple network settings, and an improved dialog based configuration system.
synIRCd is a C++ Open Source IRC Daemon / Framework based around an IRC3 protocol 'design'. (Project has no affiliation to synIRC network and is completely separate).