Open Source ICQ Software

Miranda IM is an open source, multi-protocol instant messaging client designed to be very light on system resources, extremely fast and customizable. A powerful plugin-based architecture make Miranda IM one of the most flexible clients on the planet.

Miranda NG is a successor of a popular multi-protocol instant messaging client for Windows, Miranda IM. Very light on system resources and extremely fast. Supports Em-LAN Facebook, Gadu-Gadu, ICQ / MRA, IRC Internet Relay Chat, Jabber XMPP, MinecraftDynmap, Omegle, Sametime, SkypeWeb, Steam, Tox, Twitter, and VKontakte. Linux is not a natively supported operating system, but Miranda is known to run on Linux under Wine. PluginUpdater is responsible for keeping your Miranda up-to-date. It checks for updates for all installed plugins and other components like icon sets and langpack regularly (depending on its settings) and performs updating automatically.

Bot Sentry is a Pidgin (libpurple) plugin to prevent Instant Message (IM) spam. It allows you to ignore IMs unless the sender is in your Buddy List, the sender is in your Allow List, or the sender correctly answers a question you have predefined.

A pidgin plugin that allows user to assign global hotkeys (e.g. Ctrl+Alt+g) for togglling buddy list and reading queued message. When "Toggle List" hotkey is enabled, it makes the buddy list hidden from your taskbar and task switcher (similar to ICQ).

Jarl is a Perl/Tk Client. It strives to provide full functionality with every aspect of the Jabber IM system. It currently supoprts messaging, chat, groupchat, ICQ, AIM, and IRC support.

MSN ProxIRC is an IRC proxy (server) written in C++ which makes use of libMSN and OpenSSL. Whatever IRC server you are proxying, it shows virtual rooms to chat directly with your MSN contacts. Thread-safe and blazing fast.

Ayttm is an instant messenger program, supporting various protocols such as MSN, Yahoo, AIM, Jabber, and more. It is the heir of the Everybuddy project, and aims to continue improving the program and addressing its shortcomings.

The BeOS Instant Messaging Kit project aims to create a BeOS-centric, generic instant messaging servuice for workstations. The system will follow the BeOS kits/servers model, and different IM protocols will be supported through add-ons to the im_server,

This program serves as a link between two or more chat networks, allowing users on one network to communicate with users on another network. For example, you can be logged onto Battle.net and be talking to people on IRC and people on AIM at the same tim

The aim of this project is to design an open standard of distributed instant messenger protocol. Therefore, everyone can host instant messenger services through simple installation of server program that we provided.

FServ for pidgin lets you share your files through any instant messaging protocol suported by pidgin. Just put your files in the shared folder and any buddy can get it.

Fire is a multi-protocol instant messenger client for Mac OS X based on freely available libraries for each service. Currently Fire handles AOL Instant Messenger®, ICQ®, MSN® Messenger, Jabber, limited IRC, Yahoo!®, and Apple Bonjour communications.

A fork of pidgin which aims to provide minor features that have not been addressed by the pidgin development team (including manual textbox resizing). See funpidgin.sf.net for details.

GAIM-STL provides a simple/secure transport layer over any existing Gaim protocol. STL plugins can be used to encrypt/decrypt text as needed.

An open-sourced all-in-one messenging client. The client includes AOL OSCAR, IRC, MSN Messenger, Yahoo! Messenger, and ICQ (OSCAR). Written in Java for cross-platform support.

Provides an overlay notification of events while using Gaim Instant Messaging client. This software utilizes the xosd library and should therefore support any platform that xosd and Gaim support.

Gaim for Qtopia is an official port of the multi-protocol instant messenger client Gaim for the Zaurus and other PDAs running Qtopia. It supports AIM, ICQ, MSN, Yahoo!, IRC, Jabber, Gadu-Gadu, and Napster.

ICQGATE is a 'gate' providing access to your IRC network for ICQ users. It can use multiple uins simultaneously, so there is nearly no maxusers limit. Currently can can be used only in hybrid-based networks

IMGIANT is a GTK based instant messenger application. It will support 8 different protocols, (aim, yahoo, icq, msn, napster, jabber, gadu, groupwise) and contain all features that an Instant messenger should contain, including more it shouldnt!

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)

JChatIM is an instant messaging (IM) system written in Java with support of smileys and skins

JuMPingSoCketS is a Java Multi Protocol Server Client System (JMPSCS). It is a plugin-oriented communication tool for serveral filetransfer- and chatprotocols for both client and server protocols.

KYchat is an evolution of the old irc client mIRC (TM). The goal is to make a MDI IM (IRC, MSN, ICQ) client that is easy on memory, extremely fast, and will run on linux or win32 platforms.

Kopete is a flexible and extendable multiple protocol instant messaging system designed as a plugin-based system.

Kraken is a continuation of the Openfire IM Gateway plugin, but in a way that works for any XMPP server. It provides a way for XMPP users to log into, and communicate through, their legacy IM accounts such as AIM, ICQ, MSN, Yahoo, and friends.