JabberTools is a set of console and Web-based Perl tools depending on Net::Jabber that makes it easier to use Jabber and convert to using Jabber from other instant messaging systems (e.g., AOL and ICQ). The tools include a Jabber account manager and an importer that converts your previous contact lists/rosters/buddy lists into your Jabber roster.
Pedbot is an AOL Instant Messenger robot that features Eliza mode, area code lookup, calculator, dictionary, Google search/spell, IP mapper, password generator, pickup line generator, random quote, random fact, stock quotes, weather, zip to zip distance, and more. Administrative features include wrappers for: ping, nmap, traceroute, dig, whois, w, host, the ability to set configuration hash values through messaging, and initiating conversations with others, manual block / warn commands, and more.
AIMSpy is an application that parses and displays content from instant messaging systems using the local network. It is multi-threaded, uses BPF devices for network access, and includes fairly thorough support for the AIM chat protocol and rudimentary support for the Rendezvous (iChat) protocol.