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144 Communication systems software solutions and projects

  • Discourse

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

    9.9 6.8 L2 Python
    Social networking and news website where registered community members can submit content.
  • Mattermost

    9.8 9.9 L1 JavaScript
    Open-source, on-prem Slack-alternative. It can be integrated with Gitlab.
  • Rocket.Chat

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

    9.8 9.6 L4 Ruby
    Distributed social networking server.
  • Mastodon

    9.7 10.0 L5 Ruby
    A GNU Social-compatible microblogging server
  • Tox

    9.6 0.3 L3 C
    A distributed, secure messenger with audio and video chat capabilities.
  • NodeBB

    9.6 9.9 L2 JavaScript
    Node.js based forum software built for the modern web.
  • Lets-Chat

    9.6 4.8 L5 JavaScript
    A self hosted chat suite written in Node.
  • Telescope

    9.5 9.6 JavaScript
    An open-source social news app built with Meteor.
  • Mailpile

    9.4 9.3 L2 Python
    Webmail client with search, filtering, encryption features and more.
  • Flarum

    9.4 3.0 ApacheConf
    Delightfully simple forums. Flarum is the next-generation forum software that makes online discussion fun again.
  • Zulip

    9.3 10.0 L2 Python
    Zulip is a powerful, open source group chat application.
  • Mail-in-a-Box

    9.3 7.8 L3 Python
    Turns any Ubuntu server into a fully functional mail server with one command.
  • Postal

    9.2 8.9 Ruby
    A fully featured open source mail delivery platform for incoming & outgoing e-mail
  • HumHub

    9.1 9.7 L4 PHP
    A flexible kit for private social networks.
  • ejabberd

    8.9 9.6 Erlang
    XMPP instant messaging server.
  • Actor

    8.7 5.7 L2 Java
    Actor is an open source fast open source messaging platform with rich mobile and web clients.
  • MailCatcher

    8.6 3.1 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.
  • Shout

    8.6 0.0 L4 JavaScript
    The self-hosted web IRC client.
  • Roundcube

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

    8.4 0.0 JavaScript
    Kandan is an Open Source Alternative to HipChat.
  • Friends

    8.3 1.5 L4 JavaScript
    P2P chat powered by the web.
  • Haraka

    8.3 8.9 L3 JavaScript
    A high-performance, pluginable SMTP server written in JavaScript.
  • Mautic

    8.3 9.9 L2 PHP
    Mautic is marketing automation software
  • Openfire

    8.2 8.8 L1 Java
    Real time collaboration
  • Symphony

    8.2 9.8 L1 Java
    A modern community
  • Converse.js

    8.1 9.6 L2 JavaScript
    A free and open-source XMPP chat client in your browser.
  • RainLoop

    8.1 7.8 L3 PHP
    Simple, modern & fast webmail with IMAP/SMTP Support and multi accounting.
  • Mumble

    8.1 9.5 L1 C++
    Low-latency, high quality voice/text chat software.
  • Vanilla Forums

    8.1 9.8 L2 PHP
    Simple and flexible forum software.
  • Synapse

    8.0 9.7 L3 Python
    A server for Matrix, an open standard for decentralized persistent communication.
  • Isso

    7.9 6.4 L4 Python
    A lightweight commenting server written in Python and JavaScript. It aims to be a drop-in replacement for Disqus.
  • docker-mailserver

    7.9 8.0 Shell
    A fullstack but simple mail server
  • Jitsi Meet

    7.9 9.8 L4 JavaScript
    Jitsi Meet is an OpenSource
  • hack.chat

    7.8 4.1 L3 JavaScript
    A minimal, distraction-free chat application.
  • Mailtrain

    7.8 9.1 HTML
    self hosted newsletter application built on Node.js
  • MailHog

    7.8 5.1 Go
    Small Golang executable which runs an SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development.
  • Centrifugo

    7.7 7.9 Go
    Language-agnostic real-time messaging
  • Loomio

    7.7 9.9 L3 Ruby
    Loomio is a collaborative decision-making tool that makes it easy for anyone to participate in decisions which affect them.
  • Pump.io

    7.7 9.4 L4 JavaScript
    Stream server that does most of what people really want from a social network.
  • phpBB

    7.7 9.5 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.
  • Bootcamp

    7.6 9.0 JavaScript
    An enterprise social network.
  • Elgg

    7.6 9.4 L3 PHP
    A powerful open source social networking engine.
  • ZNC

    7.5 8.2 L1 C++
    An advanced IRC bouncer.
  • Candy

    7.4 2.0 L3 JavaScript
    Multi user XMPP client written in Javascript.
  • Live Helper Chat

    7.3 9.3 L3 PHP
    Live Support chat for your website.
  • Hubl.in

    7.3 5.6 L3 JavaScript
    WebRTC powered video conference, chat and collaborative editor.
  • TextBelt

    7.2 3.8 L3 JavaScript
    An outgoing SMS API that uses carrier-specific gateways to deliver your text messages for free, and without ads.
  • twister

    7.2 4.0 L1 C++
    Fully decentralized P2P microblogging platform leveraging the free software implementations of Bitcoin and BitTorrent protocols.
  • Kaiwa

    7.1 0.9 L4 JavaScript
    Web based chat client in the style of common paid alternatives.
  • Vector

    7.1 9.8 L4 JavaScript
    A glossy Matrix web client with an emphasis on performance and usability.
  • formspree

    7.1 8.3 L3 Python
    Easy HTML form without PHP or JavaScript
  • flaskbb

    7.0 8.7 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.
  • The Lounge

    6.9 9.4 L4 JavaScript
    The self-hosted web IRC client.
  • MongooseIM

    6.9 9.6 Erlang
    Fork of ejabberd.
  • Weechat

    6.8 9.7 L1 C
    A fast, light and extensible chat client.
  • Mailcow

    6.8 8.3 L2 PHP
    Mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration.
  • Modoboa

    6.6 9.1 L5 Python
    Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.
  • Kamailio

    6.6 9.9 L2 C
    Modular SIP server
  • Kazoo

    6.5 9.7 Erlang
    KAZOO is an open-source, highly scalable software platform designed to provide carrier-grade VoIP switch functions and features.
  • Mailman

    6.4 0.0 L5 Ruby
    The Gnu mailing list server.
  • MyBB

    6.4 8.5 L1 PHP
    Free, extensible forum software package.
  • Jitsi Video Bridge

    6.2 9.3 L1 Java
    WebRTC compatible Selective Forwarding Unit
  • Scrollback

    6.1 0.0 L3 JavaScript
    Embeddable cross-platform chat for communities.
  • Friendica

    6.1 9.9 L1 PHP
    Social Communication Server.
  • Spreed

    6.1 1.5 JavaScript
    WebRTC audio/video calls, conferencing server, and web client.
  • IRCAnywhere

    6.1 0.0 L4 JavaScript
    Open-source self-hosted alternative to IRCCloud.
  • RetroShare

    5.8 9.8 L1 C++
    Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.
  • Jappix

    5.8 0.9 JavaScript
    Jappix is an open social platform, that let's you easily get or keep in touch with everyone.
  • Asterisk

    5.8 9.5 L2 C
    An easy to use but advanced IP PBX system, VoIP gateway and conference server.
  • Quassel IRC

    5.7 6.9 L1 C++
    distributed IRC client, meaning that one
  • Movim

    5.7 9.6 L3 PHP
    A brand new social network, full of awesome features in a modern and smart interface.
  • Hawkpost

    5.7 8.3 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.
  • Niltalk

    5.7 1.3 Go
    A simple, private, persistence-free web based multi-room chat server + client.
  • Maildrop

    5.6 1.2 CSS
    Disposable email SMTP server, also useful for development.
  • Node-Chat

    5.5 0.9 L2 JavaScript
    A not-so-basic open-source chat with admin features.
  • Mibew

    5.5 7.0 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.
  • Freenet

    5.5 6.7 L1 Java
    Anonymously share files, browse and publish "freesites"
  • JSXC

    5.4 8.8 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.
  • Mamute QA

    5.4 2.0 L5 Java
    Q&A Engine
  • Kontalk

    5.4 9.5 L1 Java
    Kontalk is an Open Source Messenger, similar to WhatsApp
  • Anahita

    5.3 8.1 L3 PHP
    Open Source Social Networking Framework & Platform.
  • CHVote

    5.3 5.7 L5 Java
    An opensource, publicly owned evoting system from Switzerland
  • OSSN

    5.2 8.9 L3 PHP
    Open Source Social Network
  • FusionPBX

    5.2 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.
  • FluxBB

    5.2 0.0 L3 PHP
    Fast, light, user-friendly forum software for your website.
  • Convos

    5.1 9.1 L4 Perl
    Always online web IRC client.
  • Hubzilla

    5.0 9.9 L1 PHP
    Independent general-purpose websites that not only connect with their associated members and viewers, but also connect together.
  • WebMail Lite

    4.9 4.7 L2 PHP
    Web-based IMAP Mail client.
  • Exim

    4.8 9.3 L1 C
    Message transfer agent
  • MiAOU

    4.8 8.7 L3 JavaScript
    A multi-room persistent chat server.
  • MailyHerald

    4.7 3.3 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.
  • Spectrum 2

    4.6 6.7 C
    Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks.
  • Cypht

    4.6 9.6 L4 PHP
    A feed reader for your email accounts.
  • Dovecot

    4.5 9.9 L3 C
    IMAP and POP3 server written primarily with security in mind.
  • Mailu

    4.2 7.9 Python
    Mailu is a simple yet full-featured mail server as a set of Docker images.
  • OpenSMTPD

    4.1 7.6 L2 C
    Secure SMTP server implementation from the OpenBSD project.
  • BuddyPress

    3.8 9.2 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

    3.7 1.0 L3 JavaScript
    Peer-to-peer video chat that works.
  • Pushjet

    3.5 1.8 L5 Python
    A self hosted push notification service built with a simple API making sending notifications easy.
  • PPnet

    3.3 1.0 L4 JavaScript
    Create and host your own social network.
  • cartulary

    3.2 8.2 L2 PHP
    RSS reader, readability tool, article archiver, microblogger, social graph manager and reading list manager.
  • GNU social

    3.1 6.1 L3 PHP
    Social communication software for both public and private communications.
  • Dada Mail

    3.1 9.1 L3 Perl
    A web-based list management system that can be used for announcement lists and/or discussion lists.
  • Metronome IM

    3.0 1.1 Lua
    Fork of Prosody IM.
  • 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.
  • Cherry

    3.0 2.1 Go
    A tiny webchat server.
  • Newebe

    2.9 0.1 L4 JavaScript
    A Distributed Social Network.
  • Slimta

    2.8 4.5 L5 Python
    Mail Transfer Library built on Python.
  • Ring

    2.8 7.3 L3 Python
    Free software for universal communication which respects freedoms and privacy of its users.
  • phpList

    2.7 8.7 L2 PHP
    Newsletter and email marketing with advanced management of subscribers, bounces, and plugins.
  • Rallly

    2.7 6.0 CSS
    Rallly is a free collaborative scheduling service.
  • RedMatrix

    2.6 1.3 L1 PHP
    Complete decentralised publishing, sharing, and communications system.
  • Freepbx

    2.6 9.0 L2 PHP
    Web-based open source GUI.
  • Robust IRC

    2.5 7.4 Go
    RobustIRC is IRC without netsplits. Distributed IRC server, based on RobustSession protocol.
  • 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 7.3 L1 Java
    XMPP server implementation in Java.
  • Inboxen

    2.3 8.8 Python
    Inboxen is a service that provides you with an infinite number of unique inboxes.
  • Syndie

    2.1 2.2 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.
  • Ostel

    2.0 0.0 L5 Ruby
    Secure SIP telephony setup with ZRTP encryption.
  • dyu/comments

    1.7 9.2 CSS
    A markdown-enabled comment engine powered by leveldb.
  • Courier MTA

    1.6 7.7 L1 C
    Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.
  • Abilian SBE

    1.4 9.4 JavaScript
    Open Source Collaboration and Social Networking framework & platform.
  • iRedMail

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

    0.9 0.0
    Secure Sendmail replacement.
  • XiVO

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

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

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

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

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

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

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

    - -
    Web frontend from Salut à Toi.
  • Sendmail

    - -
    Message transfer agent
  • Cyrus IMAP/POP3

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

    - -
    A mailing list manager.
  • SquirrelMail

    - -
    Another browser-based IMAP client.
  • Tokumei

    - -
    Anonymous microblogging platform.
  • Schleuder

    - -
    A GPG-enabled mailing list manager with resending-capabilities.

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