161 Communication systems software solutions and projects

  • Rocket.Chat

    9.9 9.8 L3 JavaScript
    Teamchat solution similar to Gitter.im or Slack.
  • Discourse

    9.9 10.0 L2 Ruby
    Advanced forum / community solution based on Ruby and JS.
  • Mastodon

    9.8 9.8 L5 Ruby
    A GNU Social-compatible microblogging server
  • Reddit

    9.8 0.0 L2 Python
    Social networking and news website where registered community members can submit content.
  • Mattermost

    9.8 9.8 L1 JavaScript
    Open-source, on-prem Slack-alternative. It can be integrated with Gitlab.
  • ZeroNet

    9.7 9.6 Python
    Open, free, and uncensorable websites, using Bitcoin cryptography and BitTorrent network.
  • Symphony

    9.7 9.5 L1 Java
    A modern community
  • diaspora*

    9.7 9.0 L4 Ruby
    Distributed social networking server.
  • NodeBB

    9.6 9.8 L2 JavaScript
    Node.js based forum software built for the modern web.
  • Zulip

    9.6 10.0 L2 Python
    Zulip is a powerful, open source group chat application.
  • Tox

    9.4 0.4 L3 C
    A distributed, secure messenger with audio and video chat capabilities.
  • Flarum

    9.4 4.0 ApacheConf
    Delightfully simple forums. Flarum is the next-generation forum software that makes online discussion fun again.
  • Lets-Chat

    9.4 0.0 L5 JavaScript
    A self hosted chat suite written in Node.
  • Telescope

    9.3 9.4 JavaScript
    An open-source social news app built with Meteor.
  • Mail-in-a-Box

    9.2 7.6 L3 Python
    Turns any Ubuntu server into a fully functional mail server with one command.
  • Postal

    9.2 5.8 Ruby
    A fully featured open source mail delivery platform for incoming & outgoing e-mail
  • Mailpile

    9.2 8.5 L2 Python
    Webmail client with search, filtering, encryption features and more.
  • HumHub

    9.0 9.2 L4 PHP
    A flexible kit for private social networks.
  • Jitsi Meet

    8.8 9.7 L4 JavaScript
    Jitsi Meet is an OpenSource
  • ejabberd

    8.8 9.6 Erlang
    XMPP instant messaging server.
  • Synapse

    8.6 9.9 L3 Python
    A server for Matrix, an open standard for decentralized persistent communication.
  • Roundcube

    8.5 9.4 L3 PHP
    Browser-based IMAP client with an application-like user interface.
  • docker-mailserver

    8.5 5.3 Shell
    A fullstack but simple mail server
  • MailCatcher

    8.5 4.6 L5 Ruby
    Ruby gem that deploys a simply SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development.
  • Mautic

    8.5 9.8 L2 PHP
    Mautic is marketing automation software
  • MailHog

    8.5 0.4 Go
    Small Golang executable which runs an SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development.
  • Actor

    8.4 0.0 L2 Java
    Actor is an open source fast open source messaging platform with rich mobile and web clients.
  • Mailtrain

    8.3 6.2 HTML
    self hosted newsletter application built on Node.js
  • Haraka

    8.2 8.2 L3 JavaScript
    A high-performance, pluginable SMTP server written in JavaScript.
  • Shout

    8.2 0.0 L4 JavaScript
    The self-hosted web IRC client.
  • Centrifugo

    8.2 8.1 Go
    Language-agnostic real-time messaging
  • Isso

    8.2 7.5 L4 Python
    A lightweight commenting server written in Python and JavaScript. It aims to be a drop-in replacement for Disqus.
  • Openfire

    8.2 9.4 L1 Java
    Real time collaboration
  • Vector

    8.2 9.7 L4 JavaScript
    A glossy Matrix web client with an emphasis on performance and usability.
  • RainLoop

    8.1 7.2 L3 PHP
    Simple, modern & fast webmail with IMAP/SMTP Support and multi accounting.
  • Mail For Good

    8.1 0.1 JavaScript
    An open source email campaign management tool for nonprofits.
  • Mumble

    8.0 8.1 L1 C++
    Low-latency, high quality voice/text chat software.
  • The Lounge

    7.9 9.4 L4 JavaScript
    The self-hosted web IRC client.
  • Friends

    7.9 0.3 L4 JavaScript
    P2P chat powered by the web.
  • Converse.js

    7.9 9.7 L2 JavaScript
    A free and open-source XMPP chat client in your browser.
  • Bootcamp

    7.8 4.2 JavaScript
    An enterprise social network.
  • Kandan

    7.8 0.0 JavaScript
    Kandan is an Open Source Alternative to HipChat.
  • Tutanota makes encryption easy

    7.7 9.8 JavaScript
    Tutanota is the end-to-end encrypted mail client that enables you to communicate securely with anyone.
  • Vanilla Forums

    7.7 9.9 L2 PHP
    Simple and flexible forum software.
  • ProtonMail Web Client

    7.7 9.7 JavaScript
    Official AngularJS web client for the ProtonMail secure email service.
  • Loomio

    7.6 9.9 L3 Ruby
    Loomio is a collaborative decision-making tool that makes it easy for anyone to participate in decisions which affect them.
  • hack.chat

    7.6 0.0 L3 JavaScript
    A minimal, distraction-free chat application.
  • formspree

    7.5 5.9 L3 Python
    Easy HTML form without PHP or JavaScript
  • phpBB

    7.5 9.2 L2 PHP
    Flat-forum bulletin board software solution that can be used to stay in touch with a group of people or can power your entire website.
  • Pump.io

    7.4 6.1 L4 JavaScript
    Stream server that does most of what people really want from a social network.
  • Elgg

    7.4 9.3 L3 PHP
    A powerful open source social networking engine.
  • flaskbb

    7.3 6.6 L4 Python
    FlaskBB is forum software written in Python using the microframework Flask. You can easily create new topics, posts and send other users private messages. It also includes basic administration and moderation tools.
  • TextBelt

    7.3 6.7 L3 JavaScript
    An outgoing SMS API that uses carrier-specific gateways to deliver your text messages for free, and without ads.
  • ZNC

    7.2 8.2 L1 C++
    An advanced IRC bouncer.
  • Live Helper Chat

    7.2 9.2 L3 PHP
    Live Support chat for your website.
  • Hubl.in

    7.1 0.0 L3 JavaScript
    WebRTC powered video conference, chat and collaborative editor.
  • Candy

    7.0 0.0 L3 JavaScript
    Multi user XMPP client written in Javascript.
  • Weechat

    7.0 9.4 L1 C
    A fast, light and extensible chat client.
  • Kamailio

    7.0 9.8 L2 C
    Modular SIP server
  • twister

    6.9 0.4 L1 C++
    Fully decentralized P2P microblogging platform leveraging the free software implementations of Bitcoin and BitTorrent protocols.
  • Mailcow

    6.8 1.0
    Mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration.
  • Kaiwa

    6.8 0.0 L4 JavaScript
    Web based chat client in the style of common paid alternatives.
  • MongooseIM

    6.8 9.8 Erlang
    Fork of ejabberd.
  • Jitsi Video Bridge

    6.8 7.4 L1 Java
    WebRTC compatible Selective Forwarding Unit
  • Modoboa

    6.7 7.7 L5 Python
    Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.
  • Mailu

    6.7 9.3 Python
    Mailu is a simple yet full-featured mail server as a set of Docker images.
  • Asterisk

    6.6 9.1 L2 C
    An easy to use but advanced IP PBX system, VoIP gateway and conference server.
  • Kazoo

    6.5 9.5 Erlang
    KAZOO is an open-source, highly scalable software platform designed to provide carrier-grade VoIP switch functions and features.
  • MyBB

    6.3 8.4 L1 PHP
    Free, extensible forum software package.
  • RetroShare

    6.2 9.5 L1 C++
    Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.
  • Friendica

    6.2 9.9 L1 PHP
    Social Communication Server.
  • Spreed

    6.2 0.0 JavaScript
    WebRTC audio/video calls, conferencing server, and web client.
  • Movim

    6.0 9.3 L3 PHP
    A brand new social network, full of awesome features in a modern and smart interface.
  • Node-Chat

    6.0 1.2 L2 JavaScript
    A not-so-basic open-source chat with admin features.
  • Mailman

    5.9 0.7 L5 Ruby
    The Gnu mailing list server.
  • FusionPBX

    5.9 9.9 PHP
    An open source project that provides a customizable and flexible web interface to the very powerful and highly scalable multi-platform voice switch called FreeSWITCH.
  • OSSN

    5.9 8.8 L3 PHP
    Open Source Social Network
  • Broid

    5.7 0.0 JavaScript
    Broid enables rich conversations on all messaging channels within a single schema integration using W3C standards.
  • JSXC

    5.6 9.0 JavaScript
    A Real-time XMPP web chat application with video calls, file transfer and encrypted communication. There are also versions for Nextcloud/Owncloud and SOGo.
  • Homer

    5.6 5.7 Shell
    Troubleshooting & Monitoring VOIP calls
  • Quassel IRC

    5.5 8.1 L1 C++
    distributed IRC client, meaning that one
  • Freenet

    5.5 7.8 L1 Java
    Anonymously share files, browse and publish "freesites"
  • Scrollback

    5.5 0.0 L3 JavaScript
    Embeddable cross-platform chat for communities.
  • Kontalk

    5.4 9.0 L1 Java
    Kontalk is an Open Source Messenger, similar to WhatsApp
  • Maildrop

    5.4 1.3 CSS
    Disposable email SMTP server, also useful for development.
  • IRCAnywhere

    5.4 0.0 L4 JavaScript
    Open-source self-hosted alternative to IRCCloud.
  • Jappix

    5.3 0.0 JavaScript
    Jappix is an open social platform, that let's you easily get or keep in touch with everyone.
  • Hawkpost

    5.3 3.6 L5 Python
    HawkPost is a web app that lets you create unique links that you can share with a person that desires to send you important information but doesn't know how to encrypt it. The message is encrypted in their browser and sent to your email address.
  • Mibew

    5.3 5.9 PHP
    Mibew Messenger is an open-source live support application written in PHP and MySQL. It enables one-on-one chat assistance in real-time directly from your website.
  • Hubzilla

    5.3 9.8 L1 PHP
    Independent general-purpose websites that not only connect with their associated members and viewers, but also connect together.
  • Niltalk

    5.2 0.9 Go
    A simple, private, persistence-free web based multi-room chat server + client.
  • CHVote

    5.1 4.0 L5 Java
    An opensource, publicly owned evoting system from Switzerland
  • Exim

    5.1 9.2 L1 C
    Message transfer agent
  • Anahita

    5.0 6.3 L3 PHP
    Open Source Social Networking Framework & Platform.
  • Mamute QA

    5.0 1.8 L5 Java
    Q&A Engine
  • Cypht

    4.9 9.0 L4 PHP
    A feed reader for your email accounts.
  • Dovecot

    4.9 9.7 L3 C
    IMAP and POP3 server written primarily with security in mind.
  • FluxBB

    4.8 7.1 L3 PHP
    Fast, light, user-friendly forum software for your website.
  • WebMail Lite

    4.8 0.9 L2 PHP
    Web-based IMAP Mail client.
  • Convos

    4.7 4.4 L4 Perl
    Always online web IRC client.
  • MailyHerald

    4.6 0.0 L5 Ruby
    Self-hosted Mailchimp alternative that you can easily integrate with your site. Helps you send and manage your application mailings. It support email marketing and conducting the daily stream of notifications you send to your users.
  • MiAOU

    4.5 7.7 L3 JavaScript
    A multi-room persistent chat server.
  • Spectrum 2

    4.4 8.3 C
    Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks.
  • OpenSMTPD

    4.1 8.4 L2 C
    Secure SMTP server implementation from the OpenBSD project.
  • BuddyPress

    3.9 9.4 L2 PHP
    A powerful plugin that takes your WordPress.org powered site beyond the blog with social-network features like user profiles, activity streams, user groups, and more.
  • Tuber

    3.9 1.2 L3 JavaScript
    Peer-to-peer video chat that works.
  • Socialhome

    3.8 8.9 Python
    Federated and decentralized profile builder and social network engine.
  • Pushjet

    3.8 0.0 L5 Python
    A self hosted push notification service built with a simple API making sending notifications easy.
  • Rallly

    3.5 2.3 CSS
    Rallly is a free collaborative scheduling service.
  • Cherry

    3.3 0.0 Go
    A tiny webchat server.
  • cartulary

    3.2 7.0 L2 PHP
    RSS reader, readability tool, article archiver, microblogger, social graph manager and reading list manager.
  • Slimta

    3.1 4.1 L5 Python
    Mail Transfer Library built on Python.
  • PPnet

    3.1 0.0 L4 JavaScript
    Create and host your own social network.
  • Metronome IM

    3.1 8.8 Lua
    Fork of Prosody IM.
  • GNU social

    3.1 0.0 L3 PHP
    Social communication software for both public and private communications.
  • Ring

    3.0 6.8 L3 Python
    Free software for universal communication which respects freedoms and privacy of its users.
  • Dada Mail

    3.0 8.5 L3 Perl
    A web-based list management system that can be used for announcement lists and/or discussion lists.
  • Buddycloud

    3.0 0.0 L4 Java
    Tools, libraries, services and a community to build user-to-user, group and social messaging into your app. Saves time. Scales up. Supports you.
  • Newebe

    2.9 0.0 L4 JavaScript
    A Distributed Social Network.
  • phpList

    2.8 2.7 L2 PHP
    Newsletter and email marketing with advanced management of subscribers, bounces, and plugins.
  • Inboxen

    2.7 8.4 Python
    Inboxen is a service that provides you with an infinite number of unique inboxes.
  • Freepbx

    2.7 9.1 L2 PHP
    Web-based open source GUI.
  • Robust IRC

    2.6 4.4 Go
    RobustIRC is IRC without netsplits. Distributed IRC server, based on RobustSession protocol.
  • RedMatrix

    2.6 0.0 L1 PHP
    Complete decentralised publishing, sharing, and communications system.
  • Matrix Console Web

    2.5 0.0 L3 JavaScript
    A web client meant to be a showcase of Matrix capabilities, and reference implementation of the Matrix standard.
  • Tigase

    2.4 0.0 L1 Java
    XMPP server implementation in Java.
  • Ostel

    2.1 0.0 L5 Ruby
    Secure SIP telephony setup with ZRTP encryption.
  • Syndie

    2.1 1.9 L1 Java
    Syndie is a libre system for operating distributed forums.
  • GNUNet

    2.0 9.8 L2 C
    Free software framework for decentralized, peer-to-peer networking.
  • Courier MTA

    1.9 5.9 L1 C
    Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.
  • Abilian SBE

    1.8 8.8 JavaScript
    Open Source Collaboration and Social Networking framework & platform.
  • dyu/comments

    1.8 1.0 CSS
    A markdown-enabled comment engine powered by leveldb.
  • KChat

    1.6 1.7 PHP
    PHP Based Live Chat Aplication.
  • Maily-Form

    1.4 8.5 Kotlin
    Forms to Email
  • Piler

    1.1 -
    feature rich open source email archiving solution.
  • Mumblecop

    1.1 -
    Stream audio from youtube and soundcloud, simulate dice rolls, or write your own commands with a simple plugin format.
  • iRedMail

    1.1 -
    Full-featured mail server solution based on Postfix and Dovecot.
  • Qmail

    1.1 0.0
    Secure Sendmail replacement.
  • Sendmail

    - -
    Message transfer agent
  • Oxwall

    - -
    Oxwall is used for a wide range of projects starting from family sites and custom social networks to collaboration tools and enterprise community solutions.
  • Salut a toi

    - -
    Multipurpose, multi frontend, libre and decentralised communication tool.
  • Prosody IM

    - -
    Feature-rich and easy to configure XMPP server.
  • XiVO

    - -
    Unified communications server software based on Asterisk.
  • Elastix

    - -
    Unified communications server software based on Asterisk.
  • Tokumei

    - -
    Anonymous microblogging platform.
  • FreeSWITCH

    - -
    Scalable open source cross-platform telephony platform.
  • SquirrelMail

    - -
    Another browser-based IMAP client.
  • Sympa

    - -
    A mailing list manager.
  • Schleuder

    - -
    A GPG-enabled mailing list manager with resending-capabilities.
  • Cyrus IMAP/POP3

    - -
    Intended to be run on sealed servers, where normal users are not permitted to log in.
  • Libervia

    - -
    Web frontend from Salut à Toi.
  • Postfix

    - -
    Fast, easy to administer, and secure Sendmail replacement.
  • Citadel

    - -
    Feature packed, easy, versatile, and powerful mail server, thanks to exclusive "rooms" based architecture.
  • IMP

    - -
    HORDE application that provides webmail access to IMAP and POP3 accounts.
  • Wazo

    - -
    Full-featured IPBX solution built atop Asterisk with integrated Web administration interface and REST-ful API.
  • Qmailtoaster

    - -
    Stable, full-featured, easy-to-install mail server based on qmail.
  • bbPress

    - -
    bbPress is forum software with a twist from the creators of WordPress. Easily setup discussion forums inside your WordPress.org powered site.
  • Pleroma

    - -
    Federated microblogging server, Mastodon, GNU social, & ActivityPub compatible.
  • Simple NixOS Mailserver

    - -
    A complete mailserver solution leveraging the Nix Ecosystem.
  • Commento

    - -
    Commento is a discussion platform that you can embed on your blog, news articles, and any place where you want your readers to add comments.
  • Jami

    - -
    Free and universal communication platform which preserves the user's privacy and freedoms

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