Browse free open source Chat software and projects for Windows 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: 5,954 This Week
    Last Update:
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  • 2
    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: 384 This Week
    Last Update:
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  • 3
    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: 622 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: 174 This Week
    Last Update:
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    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: 4 This Week
    Last Update:
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  • 6
    Mibew Messenger 3
    Mibew Messenger is an open-source live support application allowing visitors of your site to chat with your operators.
    Downloads: 16 This Week
    Last Update:
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  • 7
    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: 2 This Week
    Last Update:
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  • 8
    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: 3 This Week
    Last Update:
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  • 9
    The project is a GUI implementation of an IRC client. The client will be based on the thresher project. The Application will support both regular IRC & web chat servers using Adapters. At start, the UI will be in Hebrew.
    Downloads: 0 This Week
    Last Update:
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  • 10
    Invisionix Systems' portable Instant Messenger (IRSIM) uses PHP and mySQL. This Open Source program interacts with ICQ, MSN, AIM, Yahoo and Jabber IMs. It features database message buffers, login, a contact list, and message input/output windows.
    Downloads: 0 This Week
    Last Update:
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  • 11
    Invisionix Systems' portable Instant Messenger (IRSIM) uses PHP and mySQL. This Open Source program interacts with ICQ, MSN, AIM, Yahoo and Jabber IMs. It features database message buffers, login, a contact list, and message input/output windows.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12
    The Ultimate SIJ-PROJECT : A P2P based software for instant messaging and File sharing. Developed in Java. Has a well designed GUI with its own Look And Feel. It allows the users to communicate with their peers and share files with them.
    Downloads: 0 This Week
    Last Update:
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  • 13
    WebAPP: Web Automated Perl Portal is easily installed on virtually any UNIX-based server which is provided by all modern hosting plans. WebAPP is the most fully-featured, versatile, free and open-source, flat-file Perl portal script available today! ----
    Downloads: 0 This Week
    Last Update:
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  • 14
    eZebra is a new p2p program with functions similar at eMule and Shareaza but we do not take it as a MOD of any of both. We understand it as "the start point of a new p2p generation". And we need you to make us believe we can do better!
    Downloads: 0 This Week
    Last Update:
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