Open Source Windows Chat Software

See https://pidgin.im/about/ for more information. Pidgin is an instant messaging program which lets you log in to accounts on multiple chat networks simultaneously. It runs on Windows, Linux, and other UNIX operating systems. Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, MXit, Novell GroupWise Messenger, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. It is written in C and makes heavy use of GLib and GTK+. Finch is a command line instant messaging program. It also lets you log in to accounts on multiple chat network simultaneously, and it is compatible with the same chat networks as Pidgin. It is written in C and makes heavy use of GLib and ncurses.

Psi is cross-platform powerful XMPP client designed for experienced users. There are builds available for MS Windows, GNU/Linux and macOS.

Psi is a cross-platform powerful XMPP client designed for experienced users. Psi+ is a development branch of Psi XMPP client. Previously is was a sort of fork but now just consider it as a space for nightly builds.

Ares Galaxy is a free, open source BitTorrent and chat program that uses its own decentralized supernode/leaf network. Ares Galaxy has a simple, quick access interface with a built in audio/video viewer. Ares allows you to share any digital file including images, audio, video, software, documents, etc. You may now easily publish your files through the Ares’ peer-to-peer (P2P) network. As a member of the virtual community, you can search and download just about any file shared by other users. The latest versions also support the BitTorrent protocol and Shoutcast radio stations.

ApexDC™ is an innovative Direct Connect client based on the DC++ and StrongDC++ projects. Direct Connect provides a rare blend of seamless file sharing and community based chat and messaging between users. ApexDC features plugins and scripting through Lua and much more. Both operators and users alike should find it a pleasant experience. Note: as of May 28th 2016 ApexDC is now primarily distributed as two separate installers one targetting 32bit and the other 64bit operating systems. Additionally XP compatible binaries are now only offered as a separate download from the files section.

phpMyChat-Plus is an easy-to-install, easy-to-use multi-room PHP/DB chat. It is currently available for MySQLi, MariaDB, PostgreSQL, and ODBC. It supports IRC-like commands, moderators, is available in 24 languages and fully compatible with php7.

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.

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.

Anope Services are built off of the original Epona code written by Lara which is built off of IRC Services. These services have advanced the original Epona code and include new features such as Modules, Mysql, and Defcon Mode.

Kadu is a dynamically evolving instant messenger compatible with the Gadu-Gadu and XMPP protocol. It can be run on all platforms supporting the Qt toolkit.

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.

NOTE: This code has not been updated since 2005. Keeping it here for historical purposes. NOTE2: The code will not most probably compile against latest SILC libraries or with latest GTK either. Silky WAS a secure chat client for SILC (Secure Internet Live Conferencing) protocol. The code is written in C and the GUI is implemented using the GTK toolkit. Supported operating systems include Linux and Windows.

climm is a portable, small, yet powerful console based, fully internationalized instant messaging client supporting the current v8 ICQ protocol and XMPP.

QChat is a simple crossplatform LAN chat. It is written using Qt4 so you can compile it on any platform supported by Qt. NOTE: you need Qt 4.3 to compile and run it.

Application for file sharing with simple user interface

vnLanChat is a crossplatform LAN chat application, useful for chatting over a local area network. It uses C++ class library wxWidgets. No server needed. Win32 and Linux platforms. Win32 version has tray icon. Russian language. VyPress chat compatible.

Featureful Vypress chat/quickChat clone written for the GTK+ toolkit.

Jabba is a Jabber client wrote in java/

Lamp IM - jabber client for windows

&ML - это альтернативный клиент для сети Mail.ru Agent. Приложение для операционных систем семейства Windows.

JavaScript Chat based on DOM and AJAX technologies. Content refreshing without roundtrip of page.

IRC(Internet Relay Chat) client with some features: avatars, advanced user info, status icons, more IRC colors, pascal-like scripting, plugin support etc.

The Another Web Chat Bot (AWCB) is a kernel for easy web-based chat bot development. The current object-based version is designed to make the development of user's wcb modules simpler.

Babber is a simple Jabber bot which: 1) has easy-to-learn lightweight XMPP composing/parsing engine that can be easily ported to any platform that supports C++; 2) has useful network library; 3) supports DLL plugins to expand its functionality;

Pidgin Birthday Reminder reminds you of your buddies birthdays. Birthdays can be set by hand or be automatically filled-in for ICQ, MSN and XMPP protocols. We moved to GitHub: https://github.com/kgraefe/pidgin-birthday-reminder