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A very nice MSN compatible messenger application, aMSN Messenger is a multiplatform MSN messenger clone. Works pretty much like its Windows based counterpart. Perfect for keeping in touch with those friends who have not yet seen the light. Works on linux
VoiceChatter is a free, open source, and cross platform voice chat application. It is built for gaming, so it is light weight, yet delivers excellent voice quality over minimal bandwidth and latency. For more, visit http://www.voicechatter.net
This project is a try to write real tiny and fast XMPP/Jabber client for handheld devices, supported by Enlightment Foundation Library. I use Elementary widget toolkit and Iksemel library to make it possible.
AJAX Perl Chat is a chat/shoutbox written in Javascript on client side and Perl on server side. Extremely light server side, low bandwidth consumption, scalability, NO database, ease of use & integration, XHTML & CSS compliant, ease of administration
OpenLubbs - Light Usable Bulletin Board System. An Open Source version of the original text BBS used at Lancaster University, UK. The goal is to improve the code and make it web based. The project is not affiliated or endorsed by Lancaster University.
Rhino is a fast, light weight and high performance ircd. A system administrator can install this package on a unix like system and configure the server with easy clean configuration files.
This project contains some small programs/plugins for miscellaneous purposes. e.g. there's a light version of the common "xchat-systray" as well as a windows tool killing the internet connection on a remote pc or one to shut down several programs at once
GNU/Linux-compatible version of the now unavailable Red Light Variety Alpha software, a Hotline protocol client and server with Japanese language support. Future versions aim at more internationalization and better sharing functions.
Jabber client libraries for light java devices such as mobile phones, it brings instant messaging capabilities to every java phone (with support to MIDP), but may be used for other applications!
It uses a very tiny XML parser crafted for this project.
<b>A simple, flexible, light weight application enclosure from which rapid extension is possible in the Java programming environment. Includes the config framework similar to Apache's digester tool, except control is encapsulated in the constructor.</b>
This is a complete Messaging system, having simple online/offline messaging and task management. It has a very light weight server. A GNOME/GTK+ client is also provided. The server uses mysql. plans are underway to allow for a LDAP server to be used.
Jicra is a very simple IRC client Java applet that includes only minimal functionatily and doesn't try to look like an IRC client in any way. It just tries to be an one-channel chat room without too fancy features. This way the applet is very light-weight