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.

Jimm is an ICQ clone for mobile devices, such as celluluar phones. It is written in Java 2 Micro Edition (MIDP) and uses protocol version 8. Jimm is not affiliated with or endorsed by ICQ, Inc.

Multiprotocol plugin-based instant messenger for X11 (optionaly support KDE), Windows and MaxOS X.

Adium is an Open Source, multi-protocol instant messaging application for Mac OS X. Adium supports AIM, ICQ, Jabber, MSN, Yahoo!, Google Talk, Bonjour, Gadu-Gadu, Novell Groupwise, SIP/SIMPLE (Text), and Lotus Sametime. Additionally, it supports all of these applications at once so, even if you have multiple IM accounts, you don't have to log into each account separately.

Licq is an ICQ/AIM clone written fully in C++. It uses an extensive plugin system to manage many different functions including the MSN protocol. The main GUI is written using the Qt widget set.

Multiprotocol plugin-based instant messenger for X11 (optionaly support KDE), Windows and MaxOS X.

A "power-user" oriented Jabber client built on top of the JabberCOM COM Server. Includes most (if not all) of the Jabber functions: Basic Messaging, Group Chat, Agents, File XFers, etc.

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.

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.

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.

Configurable and extendable Icq client written in Tcl/Tk. Supports ICQv8 (OSCAR) protocol.

A CrossPlattform Instant Messenger written in Java, brings its own small Server and allows people to communicate in a LAN with static IP-Adresses. Current release has support for ICQ and AIM, more will follow. Want to contribute? Mailto project admin.

Dnipro IM - new ICQ client. Writting on Delphi. Very easy, but I want to make The Really Good IM. So, connecting to me, connecting to Dnipro!

YSM is a simple ICQ client based on the v7/v8 icq protocol version. Free of external libraries requirements, written in the C Language.

OpenICQ is a simple ICQ-Clone written in JAVA programming language. OpenICQ comes up with support for multiple languages and user profiles.

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 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).

A powerful command line-, plus a GUI editor for ICQ sound schemes. Enables people with alternative ICQ clients to make use of the many sound schemes available on the net. Written in Python, platform-independent. Separate Windows EXE is available, too!

A graphical notification plugin for the instant message client gaim. Now hosted at http://plugins.guifications.org/trac

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.

There are many people, who search server that support several protos and can work as corporate internet connection-independent ICQ gate.

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

icqlib is the most feature complete, open source, library implementation of Mirabilis' ICQ protocol available on the Internet. icqlib currently supports approximately 90% of the ICQ UDP v5 protocol and 80% of the ICQ TCP v2 protocol.

msn messenger client and servers, writed in Delphi 7/Kylix. client, dispatch server, notification server, switchboard server, nexus server and loginnet server.