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Open Source Communications Software

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

  • Gen AI apps are built with MongoDB Atlas Icon
    Gen AI apps are built with MongoDB Atlas

    The database for AI-powered applications.

    MongoDB Atlas is the developer-friendly database used to build, scale, and run gen AI and LLM-powered apps—without needing a separate vector database. Atlas offers built-in vector search, global availability across 115+ regions, and flexible document modeling. Start building AI apps faster, all in one place.
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  • Yeastar: Business Phone System and Unified Communications Icon
    Yeastar: Business Phone System and Unified Communications

    Go beyond just a PBX with all communications integrated as one.

    User-friendly, optimized, and scalable, the Yeastar P-Series Phone System redefines business connectivity by bringing together calling, meetings, omnichannel messaging, and integrations in one simple platform—removing the limitations of distance, platforms, and systems.
    Learn More
  • 1
    qBittorrent

    qBittorrent

    A free and reliable P2P BitTorrent client

    An advanced and multi-platform BitTorrent client with a nice Qt user interface as well as a Web UI for remote control and an integrated search engine. qBittorrent aims to meet the needs of most users while using as little CPU and memory as possible.
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    Downloads: 414,810 This Week
    Last Update:
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  • 2
    WinSCP

    WinSCP

    WinSCP is a free SFTP, SCP, S3, WebDAV, and FTP client for Windows.

    WinSCP is a popular free file manager for Windows supporting SFTP, FTP, FTPS, SCP, S3, WebDAV and local-to-local file transfers. A powerful tool to enhance your productivity with a user-friendly interface and automation options like .NET assembly or batch file scripting. Use WinSCP also for file editing, directory synchronization and site management. WinSCP is open-source and well documented. It is available in English and many other languages.
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    Downloads: 223,559 This Week
    Last Update:
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  • 3

    eMule

    A free peer-to-peer (P2P) file sharing client

    eMule is a free peer-to-peer (P2P) file-sharing client for Microsoft Windows that was launched in 2002 as an alternative to eDonkey2000. To date, eMule is one of the world’s largest and most trustworthy P2P file-sharing clients. eMule includes advanced search features, file checks for corruptions while downloading, a preview while downloading function, and a credit system to reward frequent uploads.
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    Downloads: 14,507 This Week
    Last Update:
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  • 4
    BeeBEEP (Free Office Messenger)

    BeeBEEP (Free Office Messenger)

    You can message and share files inside your intranet without a server.

    BeeBEEP is a secure (encryption based on Rijndael Algorithm, AES) peer to peer office messenger. You can talk and send files with all your colleagues inside a local area network such of an office, home or internet cafe without a server. BeeBEEP works also with VPNs. This serverless application is indispensable in all those places where privacy and security an essential requirement. For more info visit: https://www.beebeep.net
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    Downloads: 2,462 This Week
    Last Update:
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  • Run your private office with the ONLYOFFICE Icon
    Run your private office with the ONLYOFFICE

    Secure office and productivity apps

    A Comprehensive Alternative to Office 365 for Business
    Learn More
  • 5
    QPrompt

    QPrompt

    Personal teleprompter software for all video makers.

    Free teleprompter software for all video creators. Built with ease of use, fast performance, control accuracy, and cross-platform support in mind. QPrompt works with studio teleprompters and tablet teleprompters, cellphones, and webcams. It was also designed for use in video conferences.
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    Downloads: 989 This Week
    Last Update:
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  • 6
    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: 416 This Week
    Last Update:
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  • 7
    SquirrelMail
    SquirrelMail is a PHP-based Web email client. It includes built-in pure PHP support for IMAP and SMTP, and renders all pages in pure HTML 4.0 for maximum compatibility across browsers. It has strong MIME support and a flexible plugin system.
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    Downloads: 379 This Week
    Last Update:
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  • 8
    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: 513 This Week
    Last Update:
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  • 9
    FrostWire

    FrostWire

    Search, Download, Play, Share on Bittorrent and the cloud

    FrostWire https://www.frostwire.com/ is a media player, Video Downloader and Peer to Peer (P2P) information sharing client for the BitTorrent network. This project is not affiliated with LimeWire LLC. FrostWires' source code is Licensed under the GNU GPL and Apache Open Source licenses. System Requirements Any of the following operating systems: ● Windows 10, 8, 7, Vista for Intel processors (64-bit only) ● Mac OS X 10.11 (El Capitan) or later (64-bit) ● Linux, Unix such as Solaris (64-bit) ● Android 7.0 or later 256 MB of RAM (512 MB Recommended) An active internet connection
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    Downloads: 262 This Week
    Last Update:
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  • The sales CRM that makes your life easy, so all you have to do is sell. Icon
    The sales CRM that makes your life easy, so all you have to do is sell.

    The simpler way to sell

    Welcome to the simpler way to sell. Pipedrive is CRM software that makes your life easy, for less legwork and more sales. Let us track your sales conversations, eliminate admin tasks, get you more leads and uncover how you win, because your day belongs to you. Join more than 100,000 sales teams around the world that use the CRM rated #1 by SoftwareReviews in 2019. Start your free 14-day trial and get full access – no credit card needed.
    Try it free
  • 10

    aria2 - CLI Metalink/BitTorrent client

    A multi-protocol & multi-source, cross platform download utility

    aria2 is a multi-protocol & multi-source, cross platform download utility. The supported protocols are HTTP(S), FTP, BitTorrent, Metalink. It can download a file from multiple sources/protocols and tries to utilize your maximum download bandwidth.
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    Downloads: 146 This Week
    Last Update:
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  • 11
    Gtk-Gnutella

    Gtk-Gnutella

    A GTK+ Gnutella client, optimized for speed and scalability

    A GTK+ Gnutella client, efficient, reliable and fast, written in C. It has been optimized for speed and scalability, with low-memory consumption. It is meant to be left running 24x7, using little CPU and only the configured bandwidth. It is possible to run gtk-gnutella without a GUI or using a shell interface.
    Downloads: 117 This Week
    Last Update:
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  • 12
    forma.lms

    forma.lms

    forma.lms is a Learning Management System (LMS), opensource lms

    forma.lms is an open-source, web-based elearning platform (learning management system - LMS), used to manage and deliver online training courses. It's focused on corporate training needs. The projects forma.lms ((aka formalms) was originally created as a fork of Docebo CE v 4.0.5. The support comnunity of forma.Lms is active on https://forum.formalms.org/
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    Downloads: 107 This Week
    Last Update:
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  • 13
    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: 64 This Week
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  • 14
    Mibew Messenger 3
    Mibew Messenger is an open-source live support application allowing visitors of your site to chat with your operators.
    Downloads: 176 This Week
    Last Update:
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  • 15
    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: 29 This Week
    Last Update:
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  • 16
    GeoNetwork opensource - Metadata Catalog
    A web based Metadata Catalog Server for data description and discovery. Supports both generic and geospatial data discovery. It implements international standards (e.g. ISO19115/19139/19119, ISO19115-3, DCAT-AP, CSW 2.0, OGC API Records). It originates from the United Nations and is used by many governments as geoportal software. Active development and discussion takes place on GitHub and OSGeo Discourse. You can also connect directly with the companies supporting the development. Source code available on github https://github.com/geonetwork/
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    Downloads: 121 This Week
    Last Update:
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  • 17
    Repeater controller and EchoLink software for Linux including a GUI, Qtel - the Qt EchoLink client. The SvxLink project has now moved to GitHub. The new home page for the project is http://svxlink.org/ .
    Downloads: 30 This Week
    Last Update:
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  • 18
    eMule Plus
    eMule Plus is an evolution of the original eMule project, created to improve its abilities and features, in both work efficiency and user interface.
    Downloads: 79 This Week
    Last Update:
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  • 19

    PHP Address Book

    Simple, web-based address & phone book

    Simple, web-based address & phone book, contact manager, organizer. Groups, addresses, e-Mails, phone numbers & birthdays. vCards, LDIF, Excel, iPhone, Gmail & Google-Maps supported. PHP / MySQL based.
    Downloads: 12 This Week
    Last Update:
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  • 20
    Sharik - file sharing via WI-FI

    Sharik - file sharing via WI-FI

    Sharik lets you easily share files within your local network

    Sharik is an open-source, cross-platform solution for sharing files via Wi-Fi or Mobile Hotspot. This app allows you to easily send photos, apps, files, text, literally anything, to any kind of device connected to the same network. It's convenient and blazing fast. Sharik is entirely free to use, and it contains no ads. Moreover, its source code is published on GitHub so that everyone can contribute to the development process. So, if you like it, please leave a star on our GitHub repository, and consider contributing: add a new language or help us with code. YOU CAN SEND: 1. Photos (jpg, png, gif, etc) 2. Applications (apk) 3. Files (zip, rar, 7z, pdf, etc) 4. Text GitHub page: https://github.com/marchellodev/sharik Download Sharik right now!
    Downloads: 32 This Week
    Last Update:
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  • 21
    Mailman is the GNU mailing list manager. It provides standard list management features, integrated with a web interface. Please note: the subversion repository has been retired. Please see http://wiki.list.org/x/DgAJ for details.
    Downloads: 10 This Week
    Last Update:
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  • 22
    snownews

    snownews

    RSS feed reader

    A text mode reader for RSS and Atom feeds.
    Downloads: 25 This Week
    Last Update:
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  • 23
    Please visit http://dev.frontlinesms.com
    Downloads: 7 This Week
    Last Update:
    See Project
  • 24

    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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  • 25
    Hastymail
    Hastymail is a fast, secure, rfc-compliant, cross-platform IMAP/SMTP client application written in PHP providing a clean web interface for sending and reading E-mail. This version of Hastymail is no longer being developed. We are now working on a new version, Hastymail 3, AKA, "Cypht". http://cypht.org
    Downloads: 8 This Week
    Last Update:
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