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 7.8 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.
  • diaspora*

    9.8 9.3 L4 Ruby
    Distributed social networking server.
  • Rocket.Chat

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

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

    9.7 4.2 L5 JavaScript
    A self hosted chat suite written in Node.
  • NodeBB

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

    9.6 1.2 L3 C
    A distributed, secure messenger with audio and video chat capabilities.
  • Mailpile

    9.5 9.1 L2 Python
    Webmail client with search, filtering, encryption features and more.
  • Telescope

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

    9.4 3.4 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 8.0 L3 Python
    Turns any Ubuntu server into a fully functional mail server with one command.
  • Postal

    9.2 9.0 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

    8.8 9.6 Erlang
    XMPP instant messaging server.
  • Actor

    8.7 8.1 L2 Java
    Actor is an open source fast open source messaging platform with rich mobile and web clients.
  • Shout

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

    8.6 1.3 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.
  • Roundcube

    8.5 9.2 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.
  • Haraka

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

    8.3 1.6 L4 JavaScript
    P2P chat powered by the web.
  • Mautic

    8.2 9.9 L2 PHP
    Mautic is marketing automation software
  • Openfire

    8.2 8.8 L1 Java
    Real time collaboration
  • Symphony

    8.1 9.8 L1 Java
    A modern community
  • RainLoop

    8.1 7.9 L3 PHP
    Simple, modern & fast webmail with IMAP/SMTP Support and multi accounting.
  • Vanilla Forums

    8.1 9.8 L2 PHP
    Simple and flexible forum software.
  • Converse.js

    8.0 9.6 L2 JavaScript
    A free and open-source XMPP chat client in your browser.
  • Mumble

    8.0 9.5 L1 C++
    Low-latency, high quality voice/text chat software.
  • Isso

    7.9 3.9 L4 Python
    A lightweight commenting server written in Python and JavaScript. It aims to be a drop-in replacement for Disqus.
  • Synapse

    7.9 9.7 L3 Python
    A server for Matrix, an open standard for decentralized persistent communication.
  • Loomio

    7.8 9.9 L3 Ruby
    Loomio is a collaborative decision-making tool that makes it easy for anyone to participate in decisions which affect them.
  • Jitsi Meet

    7.8 9.8 L4 JavaScript
    Jitsi Meet is an OpenSource
  • Mailtrain

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

    7.8 3.9 L3 JavaScript
    A minimal, distraction-free chat application.
  • Centrifugo

    7.7 8.2 Go
    Language-agnostic real-time messaging
  • Pump.io

    7.7 9.1 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.
  • MailHog

    7.7 5.7 Go
    Small Golang executable which runs an SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development.
  • docker-mailserver

    7.7 8.0 Shell
    A fullstack but simple mail server
  • Elgg

    7.6 9.1 L3 PHP
    A powerful open source social networking engine.
  • ZNC

    7.5 8.3 L1 C++
    An advanced IRC bouncer.
  • Candy

    7.4 2.5 L3 JavaScript
    Multi user XMPP client written in Javascript.
  • Bootcamp

    7.4 6.7 JavaScript
    An enterprise social network.
  • Hubl.in

    7.3 6.1 L3 JavaScript
    WebRTC powered video conference, chat and collaborative editor.
  • TextBelt

    7.2 3.7 L3 JavaScript
    An outgoing SMS API that uses carrier-specific gateways to deliver your text messages for free, and without ads.
  • Live Helper Chat

    7.2 9.3 L3 PHP
    Live Support chat for your website.
  • twister

    7.2 4.5 L1 C++
    Fully decentralized P2P microblogging platform leveraging the free software implementations of Bitcoin and BitTorrent protocols.
  • Kaiwa

    7.1 1.0 L4 JavaScript
    Web based chat client in the style of common paid alternatives.
  • Vector

    7.0 9.9 L4 JavaScript
    A glossy Matrix web client with an emphasis on performance and usability.
  • formspree

    7.0 8.3 L3 Python
    Easy HTML form without PHP or JavaScript
  • The Lounge

    6.9 9.3 L4 JavaScript
    The self-hosted web IRC client.
  • flaskbb

    6.9 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.
  • MongooseIM

    6.8 9.7 Erlang
    Fork of ejabberd.
  • Mailcow

    6.8 8.8 L2 PHP
    Mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration.
  • Weechat

    6.7 9.5 L1 C
    A fast, light and extensible chat client.
  • Kamailio

    6.6 9.9 L2 C
    Modular SIP server
  • MyBB

    6.5 8.5 L1 PHP
    Free, extensible forum software package.
  • Kazoo

    6.4 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.
  • Modoboa

    6.4 9.0 L5 Python
    Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.
  • IRCAnywhere

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

    6.1 9.9 L1 PHP
    Social Communication Server.
  • Scrollback

    6.1 0.0 L3 JavaScript
    Embeddable cross-platform chat for communities.
  • Jitsi Video Bridge

    6.1 9.3 L1 Java
    WebRTC compatible Selective Forwarding Unit
  • Spreed

    5.8 4.0 JavaScript
    WebRTC audio/video calls, conferencing server, and web client.
  • Jappix

    5.8 1.1 JavaScript
    Jappix is an open social platform, that let's you easily get or keep in touch with everyone.
  • Quassel IRC

    5.7 7.6 L1 C++
    distributed IRC client, meaning that one
  • Maildrop

    5.6 1.5 CSS
    Disposable email SMTP server, also useful for development.
  • Movim

    5.6 9.5 L3 PHP
    A brand new social network, full of awesome features in a modern and smart interface.
  • RetroShare

    5.6 9.8 L1 C++
    Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.
  • Hawkpost

    5.6 8.7 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.
  • Asterisk

    5.6 9.5 L2 C
    An easy to use but advanced IP PBX system, VoIP gateway and conference server.
  • Niltalk

    5.6 1.6 Go
    A simple, private, persistence-free web based multi-room chat server + client.
  • Freenet

    5.5 7.3 L1 Java
    Anonymously share files, browse and publish "freesites"
  • Node-Chat

    5.5 1.2 L2 JavaScript
    A not-so-basic open-source chat with admin features.
  • Mamute QA

    5.4 3.0 L5 Java
    Q&A Engine
  • Kontalk

    5.4 9.6 L1 Java
    Kontalk is an Open Source Messenger, similar to WhatsApp
  • Mibew

    5.4 7.2 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.
  • JSXC

    5.3 8.7 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.
  • CHVote

    5.3 6.4 L5 Java
    An opensource, publicly owned evoting system from Switzerland
  • Anahita

    5.3 8.6 L3 PHP
    Open Source Social Networking Framework & Platform.
  • OSSN

    5.2 9.0 L3 PHP
    Open Source Social Network
  • FluxBB

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

    5.0 9.4 L4 Perl
    Always online web IRC client.
  • FusionPBX

    5.0 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.
  • WebMail Lite

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

    4.9 9.8 L1 PHP
    Independent general-purpose websites that not only connect with their associated members and viewers, but also connect together.
  • Exim

    4.8 9.3 L1 C
    Message transfer agent
  • MiAOU

    4.8 8.8 L3 JavaScript
    A multi-room persistent chat server.
  • MailyHerald

    4.6 2.6 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.
  • Cypht

    4.5 9.7 L4 PHP
    A feed reader for your email accounts.
  • Spectrum 2

    4.5 6.2 C
    Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks.
  • Dovecot

    4.3 9.9 L3 C
    IMAP and POP3 server written primarily with security in mind.
  • OpenSMTPD

    4.1 7.4 L2 C
    Secure SMTP server implementation from the OpenBSD project.
  • Mailu

    4.0 8.4 Python
    Mailu is a simple yet full-featured mail server as a set of Docker images.
  • Tuber

    3.7 1.1 L3 JavaScript
    Peer-to-peer video chat that works.
  • BuddyPress

    3.7 9.3 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.
  • Pushjet

    3.4 4.6 L5 Python
    A self hosted push notification service built with a simple API making sending notifications easy.
  • PPnet

    3.2 1.0 L4 JavaScript
    Create and host your own social network.
  • cartulary

    3.2 8.3 L2 PHP
    RSS reader, readability tool, article archiver, microblogger, social graph manager and reading list manager.
  • GNU social

    3.1 6.2 L3 PHP
    Social communication software for both public and private communications.
  • Dada Mail

    3.0 9.2 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.
  • Metronome IM

    2.9 1.3 Lua
    Fork of Prosody IM.
  • Newebe

    2.9 0.7 L4 JavaScript
    A Distributed Social Network.
  • Cherry

    2.9 2.6 Go
    A tiny webchat server.
  • Slimta

    2.8 4.4 L5 Python
    Mail Transfer Library built on Python.
  • Rallly

    2.7 6.3 CSS
    Rallly is a free collaborative scheduling service.
  • Ring

    2.7 7.0 L3 Python
    Free software for universal communication which respects freedoms and privacy of its users.
  • phpList

    2.6 7.6 L2 PHP
    Newsletter and email marketing with advanced management of subscribers, bounces, and plugins.
  • RedMatrix

    2.6 1.5 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.
  • Freepbx

    2.5 9.1 L2 PHP
    Web-based open source GUI.
  • Robust IRC

    2.4 7.8 Go
    RobustIRC is IRC without netsplits. Distributed IRC server, based on RobustSession protocol.
  • Tigase

    2.3 7.9 L1 Java
    XMPP server implementation in Java.
  • Inboxen

    2.2 8.5 Python
    Inboxen is a service that provides you with an infinite number of unique inboxes.
  • Ostel

    2.0 0.0 L5 Ruby
    Secure SIP telephony setup with ZRTP encryption.
  • GNUNet

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

    2.0 2.9 L1 Java
    Syndie is a libre system for operating distributed forums.
  • dyu/comments

    1.6 9.3 CSS
    A markdown-enabled comment engine powered by leveldb.
  • Courier MTA

    1.5 5.7 L1 C
    Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.
  • Abilian SBE

    1.3 9.0 JavaScript
    Open Source Collaboration and Social Networking framework & platform.
  • iRedMail

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

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

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

    0.9 0.0
    Secure Sendmail replacement.
  • Sympa

    - -
    A mailing list manager.
  • Sendmail

    - -
    Message transfer agent
  • Cyrus IMAP/POP3

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

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

    - -
    Feature-rich and easy to configure XMPP server.
  • Salut à Toi

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

    - -
    Web frontend from Salut à Toi.
  • Postfix

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

    - -
    Another browser-based IMAP client.
  • 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.
  • FreeSWITCH

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

    - -
    Anonymous microblogging platform.
  • Schleuder

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

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

    - -
    Unified communications server software based on Asterisk.

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