Lightweight Mobile Instant Messenger is a Java platform-independent software to allow instant messaging between Mobile Phones and PCs. Specifically designed graphic-poor and with a low-bandwidth usage for use on a Internet WAP/GPRS connection.
IpChat is a comprehensive network communication tool, similar to a regular instant messenger. However IpChat unlike other IM networks is completelly decentralized, requiring no pre-existing server.
JXTA Instant Messenger (J.I.M) is a project that aims to establish a server free, pure P2P Instant Messaging system. It is based on Java, JXTA (www.jxta.org) and the Java Cryptography Extension JCE and provides a nice Swing based GUI.
Internet Relay Jabber (or IRJ) is a Jabber client for IRC. It's useful if you like IRC, but your friends use another IM service. It is written in Perl and uses Net::Jabber and Net::IRC. (This project is no longer under active development)
Instant Messenger gui made with nice Fishs. Written in python. (now only Gtk, may be later we use Qt and others). Main objetives are: be nice, fast, usable, portable, and sopport different free messengers systems/backends
No-Name Instant Messenger is a secure (strong cryptography), cross platform communications program that supports existing IM networks (AIM, Yahoo, ICQ, etc.).
This is an Instant Messenger client and server written fully in CGI with Perl. Users can register their nickname, and chat when anyone comes online. Also you can see they webcam.
Nestor is a chat client that allows all the standard functionality of most instant messaging software. However, it also determines words in the conversation that the user may not completely understand, perhaps before the user realizes their confusion