gnuBot is an IRC bot written in Perl, designed to be as flexible and easy to use as possible. Dynamically loadable modules are used for everything from networking to configuration, allowing parts to be swapped out at will. It is intended to be both a channel service bot, like an eggdrop, but also have infobot-like features.
srvx is a services package written in C from the ground up, for IRC networks that are based on IRCu 2.10.*. It is both highly efficient and extensible. Its features include Wingate, SOCKS4, and SOCKS5 proxy detection, and all the standard services users expect (ChanServ, NickServ, OpServ, Global).