161 Communication systems software solutions and projects

  • Zulip

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

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

    7.7 9.9 L2 PHP
    Simple and flexible forum software.
  • Synapse

    8.4 9.9 L3 Python
    A server for Matrix, an open standard for decentralized persistent communication.
  • Friendica

    6.3 9.9 L1 PHP
    Social Communication Server.
  • FusionPBX

    5.8 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.
  • Kamailio

    6.9 9.8 L2 C
    Modular SIP server
  • 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.
  • 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.
  • GNUNet

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

    7.8 9.8 L2 JavaScript
    A free and open-source XMPP chat client in your browser.
  • Dovecot

    4.9 9.8 L3 C
    IMAP and POP3 server written primarily with security in mind.
  • MongooseIM

    6.8 9.8 Erlang
    Fork of ejabberd.
  • Rocket.Chat

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

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

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

    7.6 9.8 JavaScript
    Official AngularJS web client for the ProtonMail secure email service.
  • Mautic

    8.5 9.8 L2 PHP
    Mautic is marketing automation software
  • Symphony

    9.7 9.7 L1 Java
    A modern community
  • Loomio

    7.6 9.7 L3 Ruby
    Loomio is a collaborative decision-making tool that makes it easy for anyone to participate in decisions which affect them.
  • Jitsi Meet

    8.7 9.6 L4 JavaScript
    Jitsi Meet is an OpenSource
  • Telescope

    9.4 9.6 JavaScript
    An open-source social news app built with Meteor.
  • Vector

    7.9 9.6 L4 JavaScript
    A glossy Matrix web client with an emphasis on performance and usability.
  • ZeroNet

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

    9.7 9.6 L1 JavaScript
    Open-source, on-prem Slack-alternative. It can be integrated with Gitlab.
  • RetroShare

    6.2 9.6 L1 C++
    Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.
  • The Lounge

    7.8 9.6 L4 JavaScript
    The self-hosted web IRC client.
  • Mailu

    6.6 9.5 Python
    Mailu is a simple yet full-featured mail server as a set of Docker images.
  • Live Helper Chat

    7.2 9.5 L3 PHP
    Live Support chat for your website.
  • HumHub

    9.0 9.5 L4 PHP
    A flexible kit for private social networks.
  • Asterisk

    6.4 9.4 L2 C
    An easy to use but advanced IP PBX system, VoIP gateway and conference server.
  • Kazoo

    6.5 9.4 Erlang
    KAZOO is an open-source, highly scalable software platform designed to provide carrier-grade VoIP switch functions and features.
  • Movim

    6.0 9.4 L3 PHP
    A brand new social network, full of awesome features in a modern and smart interface.
  • Cypht

    4.7 9.4 L4 PHP
    A feed reader for your email accounts.
  • Roundcube

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

    8.8 9.4 Erlang
    XMPP instant messaging server.
  • Metronome IM

    3.1 9.4 Lua
    Fork of Prosody IM.
  • 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.
  • phpBB

    7.5 9.3 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.
  • Exim

    5.1 9.3 L1 C
    Message transfer agent
  • Weechat

    7.0 9.3 L1 C
    A fast, light and extensible chat client.
  • Openfire

    8.2 9.2 L1 Java
    Real time collaboration
  • Elgg

    7.4 9.2 L3 PHP
    A powerful open source social networking engine.
  • Kontalk

    5.4 9.2 L1 Java
    Kontalk is an Open Source Messenger, similar to WhatsApp
  • Freepbx

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

    5.5 9.1 L1 C++
    distributed IRC client, meaning that one
  • OSSN

    5.8 9.1 L3 PHP
    Open Source Social Network
  • Mailpile

    9.3 8.9 L2 Python
    Webmail client with search, filtering, encryption features and more.
  • Bootcamp

    7.8 8.8 JavaScript
    An enterprise social network.
  • OpenSMTPD

    4.1 8.8 L2 C
    Secure SMTP server implementation from the OpenBSD project.
  • Socialhome

    3.8 8.7 Python
    Federated and decentralized profile builder and social network engine.
  • Abilian SBE

    1.8 8.7 JavaScript
    Open Source Collaboration and Social Networking framework & platform.
  • diaspora*

    9.7 8.6 L4 Ruby
    Distributed social networking server.
  • MyBB

    6.3 8.6 L1 PHP
    Free, extensible forum software package.
  • Inboxen

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

    3.0 8.4 L3 Perl
    A web-based list management system that can be used for announcement lists and/or discussion lists.
  • Mumble

    7.9 8.3 L1 C++
    Low-latency, high quality voice/text chat software.
  • MiAOU

    4.6 8.3 L3 JavaScript
    A multi-room persistent chat server.
  • Haraka

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

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

    7.4 8.1 L4 JavaScript
    Stream server that does most of what people really want from a social network.
  • Modoboa

    6.7 8.1 L5 Python
    Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.
  • Spectrum 2

    4.4 8.0 C
    Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks.
  • ZNC

    7.3 8.0 L1 C++
    An advanced IRC bouncer.
  • Jitsi Video Bridge

    6.7 8.0 L1 Java
    WebRTC compatible Selective Forwarding Unit
  • Maily-Form

    1.4 8.0 Kotlin
    Forms to Email
  • Centrifugo

    8.1 8.0 Go
    Language-agnostic real-time messaging
  • formspree

    7.5 7.9 L3 Python
    Easy HTML form without PHP or JavaScript
  • FluxBB

    4.8 7.9 L3 PHP
    Fast, light, user-friendly forum software for your website.
  • Mail-in-a-Box

    9.2 7.8 L3 Python
    Turns any Ubuntu server into a fully functional mail server with one command.
  • Anahita

    5.1 7.7 L3 PHP
    Open Source Social Networking Framework & Platform.
  • flaskbb

    7.3 7.4 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.
  • Courier MTA

    1.8 7.0 L1 C
    Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.
  • Ring

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

    5.4 6.8 L1 Java
    Anonymously share files, browse and publish "freesites"
  • Mailtrain

    8.3 6.8 HTML
    self hosted newsletter application built on Node.js
  • Mibew

    5.3 6.7 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

    5.5 6.5 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.
  • docker-mailserver

    8.5 6.5 Shell
    A fullstack but simple mail server
  • Convos

    4.7 6.0 L4 Perl
    Always online web IRC client.
  • Flarum

    9.4 5.7 ApacheConf
    Delightfully simple forums. Flarum is the next-generation forum software that makes online discussion fun again.
  • MailCatcher

    8.5 5.6 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.
  • TextBelt

    7.3 5.3 L3 JavaScript
    An outgoing SMS API that uses carrier-specific gateways to deliver your text messages for free, and without ads.
  • RainLoop

    8.1 5.2 L3 PHP
    Simple, modern & fast webmail with IMAP/SMTP Support and multi accounting.
  • Hawkpost

    5.3 5.1 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.
  • Postal

    9.2 4.9 Ruby
    A fully featured open source mail delivery platform for incoming & outgoing e-mail
  • cartulary

    3.1 4.0 L2 PHP
    RSS reader, readability tool, article archiver, microblogger, social graph manager and reading list manager.
  • Slimta

    3.1 3.7 L5 Python
    Mail Transfer Library built on Python.
  • Rallly

    3.5 3.6 CSS
    Rallly is a free collaborative scheduling service.
  • phpList

    2.8 3.4 L2 PHP
    Newsletter and email marketing with advanced management of subscribers, bounces, and plugins.
  • Mail For Good

    8.1 3.4 JavaScript
    An open source email campaign management tool for nonprofits.
  • Tuber

    3.9 2.9 L3 JavaScript
    Peer-to-peer video chat that works.
  • Mamute QA

    5.0 2.6 L5 Java
    Q&A Engine
  • KChat

    1.5 2.3 PHP
    PHP Based Live Chat Aplication.
  • WebMail Lite

    4.9 2.2 L2 PHP
    Web-based IMAP Mail client.
  • Node-Chat

    5.9 2.0 L2 JavaScript
    A not-so-basic open-source chat with admin features.
  • twister

    7.0 1.9 L1 C++
    Fully decentralized P2P microblogging platform leveraging the free software implementations of Bitcoin and BitTorrent protocols.
  • MailHog

    8.5 1.7 Go
    Small Golang executable which runs an SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development.
  • Tigase

    2.5 1.7 L1 Java
    XMPP server implementation in Java.
  • dyu/comments

    1.8 1.5 CSS
    A markdown-enabled comment engine powered by leveldb.
  • Niltalk

    5.3 1.4 Go
    A simple, private, persistence-free web based multi-room chat server + client.
  • Mailman

    6.0 1.3 L5 Ruby
    The Gnu mailing list server.
  • Tox

    9.4 1.2 L3 C
    A distributed, secure messenger with audio and video chat capabilities.
  • 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.
  • Homer

    5.4 1.0 Shell
    Troubleshooting & Monitoring VOIP calls
  • Syndie

    2.1 1.0 L1 Java
    Syndie is a libre system for operating distributed forums.
  • Friends

    8.0 0.9 L4 JavaScript
    P2P chat powered by the web.
  • Hubl.in

    7.2 0.4 L3 JavaScript
    WebRTC powered video conference, chat and collaborative editor.
  • MailyHerald

    4.6 0.2 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.
  • hack.chat

    7.6 0.2 L3 JavaScript
    A minimal, distraction-free chat application.
  • Candy

    7.1 0.0 L3 JavaScript
    Multi user XMPP client written in Javascript.
  • Kandan

    7.9 0.0 JavaScript
    Kandan is an Open Source Alternative to HipChat.
  • Lets-Chat

    9.5 0.0 L5 JavaScript
    A self hosted chat suite written in Node.
  • 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.
  • Maildrop

    5.5 0.0 CSS
    Disposable email SMTP server, also useful for development.
  • Qmail

    1.1 0.0
    Secure Sendmail replacement.
  • IRCAnywhere

    5.5 0.0 L4 JavaScript
    Open-source self-hosted alternative to IRCCloud.
  • Robust IRC

    2.6 0.0 Go
    RobustIRC is IRC without netsplits. Distributed IRC server, based on RobustSession protocol.
  • Shout

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

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

    2.9 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.
  • GNU social

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

    5.4 0.0 JavaScript
    Jappix is an open social platform, that let's you easily get or keep in touch with everyone.
  • Newebe

    2.8 0.0 L4 JavaScript
    A Distributed Social Network.
  • Reddit

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

    2.6 0.0 L1 PHP
    Complete decentralised publishing, sharing, and communications system.
  • Cherry

    3.3 0.0 Go
    A tiny webchat server.
  • Kaiwa

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

    8.5 0.0 L2 Java
    Actor is an open source fast open source messaging platform with rich mobile and web clients.
  • PPnet

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

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

    5.6 0.0 L3 JavaScript
    Embeddable cross-platform chat for communities.
  • Pushjet

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

    5.1 0.0 L5 Java
    An opensource, publicly owned evoting system from Switzerland
  • Broid

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

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

    - -
    Web frontend from Salut à Toi.
  • 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.
  • FreeSWITCH

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

    - -
    Another browser-based IMAP client.
  • Sympa

    - -
    A mailing list manager.
  • 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.
  • IMP

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

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

    - -
    Message transfer agent
  • Wazo

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

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

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

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

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

    - -
    Anonymous microblogging platform.

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