Browse free open source Chat software and projects for Windows and Mac below. Use the toggles on the left to filter open source Chat software by OS, license, language, programming language, and project status.

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  • 1
    Pidgin IM

    Pidgin IM

    A universal instant messaging (IM) program

    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.
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    Downloads: 5,831 This Week
    Last Update:
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  • 2
    Psi+

    Psi+

    Psi+ Project — development branch of Psi XMPP client

    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.
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    Downloads: 555 This Week
    Last Update:
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  • 3
    Psi

    Psi

    Psi IM — Qt-based XMPP client

    Psi is cross-platform powerful XMPP client designed for experienced users. There are builds available for MS Windows, GNU/Linux and macOS.
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    Downloads: 298 This Week
    Last Update:
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  • 4
    Mumble

    Mumble

    Low-latency, high quality voice chat for gamers

    Mumble is an open source, low-latency, high quality voice chat software primarily intended for use while gaming. It includes game linking, so voice from other players comes from the direction of their characters, and has echo cancellation so the sound from your loudspeakers won't be audible to other players.
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    Downloads: 125 This Week
    Last Update:
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  • 5
    EiskaltDC++

    EiskaltDC++

    Program for filesharing using Direct Connect and ADC protocols

    EiskaltDC++ is a cross-platform program that uses the Direct Connect and ADC protocols. It is compatible with DC++, FlylinkDC++, LinuxDC++ and other DC clients. EiskaltDC++ also interoperates with all common DC hub software.
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    Downloads: 71 This Week
    Last Update:
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  • 6
    phpMyChat

    phpMyChat

    Standalone chat system developed in php, mysql and javascript

    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.
    Downloads: 15 This Week
    Last Update:
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  • 7
    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.
    Downloads: 14 This Week
    Last Update:
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  • 8
    Mibew Messenger 3
    Mibew Messenger is an open-source live support application allowing visitors of your site to chat with your operators.
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    Downloads: 54 This Week
    Last Update:
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  • 9
    Mibew Messenger 1.x
    "Mibew Messenger" - is unique software allowing visitors of your site to chat with your operators. This repo should be treated as an obsolete. For modern version of Mibew Messenger see https://sourceforge.net/projects/mibew/
    Downloads: 6 This Week
    Last Update:
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  • 10
    Kadu
    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.
    Downloads: 9 This Week
    Last Update:
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  • 11
    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.
    Downloads: 6 This Week
    Last Update:
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  • 12

    AJAX Chat - Open Source Web Chat

    Fully customizable web chat created using AJAX.

    MOVED: This project has moved to https://github.com/Frug/AJAX-Chat AJAX Chat is a fully customizable web chat implemented in JavaScript, PHP and MySQL which integrates nicely with common forum systems like phpBB, MyBB, PunBB, SMF and vBulletin. A Flash and Ruby based socket connection can be used to boost performance.
    Downloads: 1 This Week
    Last Update:
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  • 13
    Communication protocol for advanced clients of talker Atlantis (now running at atlantis.talker.sk). No implementation. No source code. Only specfication.
    Downloads: 0 This Week
    Last Update:
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  • 14
    Free Instant Mesagging and Chat client / server
    Downloads: 0 This Week
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  • 15
    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.
    Downloads: 0 This Week
    Last Update:
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  • 16
    Jeti

    Jeti

    A XMPP client written in java

    Jeti is a Java Jabber client that supports most chat features such as file transfer, group chat, emoticons, and formatted messages. It can be used as an application or as a Web applet.
    Downloads: 0 This Week
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  • 17
    Plugable multiprotocol instant messaging client for J2ME mainly(jabber is the only one protocol yet implemented).
    Downloads: 0 This Week
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  • 18
    The gateway between lide.cz chat and IRC clients (chat clients or bots), running as a daemon on port 13801 by default.
    Downloads: 0 This Week
    Last Update:
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  • 19
    ljr - Loyal Jabber Robot is just an all-purpose robot for jabber groupchats with plugin system written in Java. Planned features: remembering facts, file server, kick/ban for vulgar words, reminder, dictionary/translation.
    Downloads: 0 This Week
    Last Update:
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  • 20
    VerliBot is a scriptable perl robot designed to work with any kind or DirectConnect Hub, anyway it is specialy VerliHub oriented. VerliBot accepts multiple modules. Has quite complete prepared environment for developement of extra bots.
    Downloads: 0 This Week
    Last Update:
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  • 21
    adapted.RS - gymplix project is an integrated community system. it\\\'s goal is to provide a means to integrate all web community components into a perfectly linked system adapted.RS - gymplix project je integorvaný diskusní systém. cílem je vytvo&#3
    Downloads: 0 This Week
    Last Update:
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  • 22

    pidgeon

    IRC client

    Pidgeon is an open source irc client. This site serves as a download repository
    Downloads: 0 This Week
    Last Update:
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