10

8

6

4

2


9.9

9.7

9.9

10.0

9.8

9.8

9.8

9.8

9.7

9.4

9.7

8.9

100 Communication systems software solutions and projects

  • Rocket.Chat

    9.9 9.7 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
  • Mattermost

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

    9.7 9.4 L1 Java
    A modern community
  • diaspora*

    9.7 8.9 L4 Ruby
    Distributed social networking server.
  • Reddit

    9.7 0.0 L2 Python
    Social networking and news website where registered community members can submit content.
  • ZeroNet

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

    9.7 9.9 L2 Python
    Zulip is a powerful, open source group chat application.
  • NodeBB

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

    9.5 4.9 ApacheConf
    Delightfully simple forums. Flarum is the next-generation forum software that makes online discussion fun again.
  • Telescope

    9.4 9.5 JavaScript
    An open-source social news app built with Meteor.
  • Lets-Chat

    9.4 0.9 L5 JavaScript
    A self hosted chat suite written in Node.
  • Tox

    9.4 0.0 L3 C
    A distributed, secure messenger with audio and video chat capabilities.
  • Postal

    9.3 5.7 Ruby
    A fully featured open source mail delivery platform for incoming & outgoing e-mail
  • Mail-in-a-Box

    9.3 7.4 L3 Python
    Turns any Ubuntu server into a fully functional mail server with one command.
  • Jitsi Meet

    9.3 9.6 L4 JavaScript
    Jitsi Meet is an OpenSource
  • Mailpile

    9.2 7.8 L2 Python
    Webmail client with search, filtering, encryption features and more.
  • Synapse

    9.0 9.9 L3 Python
    A server for Matrix, an open standard for decentralized persistent communication.
  • HumHub

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

    8.9 9.2 Erlang
    XMPP instant messaging server.
  • docker-mailserver

    8.8 8.4 Shell
    A fullstack but simple mail server
  • MailHog

    8.7 0.0 Go
    Small Golang executable which runs an SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development.
  • Mautic

    8.7 9.1 L2 PHP
    Mautic is marketing automation software
  • Roundcube

    8.6 9.4 L3 PHP
    Browser-based IMAP client with an application-like user interface.
  • Vector

    8.6 9.7 L4 JavaScript
    A glossy Matrix web client with an emphasis on performance and usability.
  • Mailtrain

    8.5 2.7 HTML
    self hosted newsletter application built on Node.js
  • MailCatcher

    8.5 6.3 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.
  • Actor

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

    8.4 8.2 Go
    Language-agnostic real-time messaging
  • Haraka

    8.3 7.2 L3 JavaScript
    A high-performance, pluginable SMTP server written in JavaScript.
  • Openfire

    8.3 9.2 L1 Java
    Real time collaboration
  • Gotify

    8.3 7.4 Go
    Self-hosted notification server with Android and CLI clients, similar to PushBullet.
  • Isso

    8.2 5.9 L4 Python
    A lightweight commenting server written in Python and JavaScript. It aims to be a drop-in replacement for Disqus.
  • RainLoop

    8.2 6.9 L3 PHP
    Simple, modern & fast webmail with IMAP/SMTP Support and multi accounting.
  • Mumble

    8.2 8.9 L1 C++
    Low-latency, high quality voice/text chat software.
  • The Lounge

    8.1 9.6 L4 JavaScript
    The self-hosted web IRC client.
  • Mail For Good

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

    8.1 0.0 L4 JavaScript
    The self-hosted web IRC client.
  • Tutanota makes encryption easy

    8.0 9.7 JavaScript
    Tutanota is the end-to-end encrypted mail client that enables you to communicate securely with anyone.
  • Friends

    8.0 0.0 L4 JavaScript
    P2P chat powered by the web.
  • Bootcamp

    8.0 5.9 JavaScript
    An enterprise social network.
  • Patchwork

    7.9 8.8 JavaScript
    Decentralized messaging and sharing app built on top of Secure Scuttlebutt
  • Kandan

    7.9 0.0 JavaScript
    Kandan is an Open Source Alternative to HipChat.
  • Listmonk

    7.9 8.3 Go
    High performance, self-hosted newsletter and mailing list manager with a modern dashboard.
  • Converse.js

    7.9 9.6 L2 JavaScript
    A free and open-source XMPP chat client in your browser.
  • ProtonMail Web Client

    7.8 9.0 JavaScript
    Official AngularJS web client for the ProtonMail secure email service.
  • Vanilla Forums

    7.8 10.0 L2 PHP
    Simple and flexible forum software.
  • formspree

    7.7 2.0 L3 Python
    Easy HTML form without PHP or JavaScript
  • Loomio

    7.7 9.3 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.
  • phpBB

    7.6 9.6 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.
  • flaskbb

    7.5 4.5 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.
  • Elgg

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

    7.4 8.0 Python
    Misago is fully featured modern forum application that is fast, scalable and responsive.
  • TextBelt

    7.4 4.2 L3 JavaScript
    An outgoing SMS API that uses carrier-specific gateways to deliver your text messages for free, and without ads.
  • Pump.io

    7.4 2.0 L4 JavaScript
    Stream server that does most of what people really want from a social network.
  • PixelFed

    7.3 9.8 PHP
    Pixelfed is an open-source, federated platform alternate to Instagram.
  • Live Helper Chat

    7.3 9.5 L3 PHP
    Live Support chat for your website.
  • ZNC

    7.3 8.0 L1 C++
    An advanced IRC bouncer.
  • Lemmy

    7.3 9.8 Rust
    A link aggregator / reddit clone for the fediverse. Reddit alternative built in Rust.
  • Weechat

    7.2 9.4 L1 C
    A fast, light and extensible chat client.
  • Kamailio

    7.2 9.8 L2 C
    Modular SIP server
  • Jitsi Video Bridge

    7.2 9.1 L1 Java
    WebRTC compatible Selective Forwarding Unit
  • Mailu

    7.2 8.9 Python
    Mailu is a simple yet full-featured mail server as a set of Docker images.
  • Hubl.in

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

    7.0 9.7 Erlang
    Fork of ejabberd.
  • Candy

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

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

    6.9 7.7 L5 Python
    Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.
  • Asterisk

    6.8 9.1 L2 C
    An easy to use but advanced IP PBX system, VoIP gateway and conference server.
  • Coral

    6.8 9.3 TypeScript
    A better commenting experience from Vox Media.
  • 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.
  • remark42

    6.7 9.3 Go
    A lightweight and simple comment engine, which doesn't spy on users. It can be embedded into blogs, articles or any other place where readers add comments.
  • Kaiwa

    6.7 0.0 L4 JavaScript
    Web based chat client in the style of common paid alternatives.
  • RetroShare

    6.5 9.6 L1 C++
    Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.
  • 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

    6.4 7.9 L1 PHP
    Free, extensible forum software package.
  • Misskey

    6.3 9.8 TypeScript
    Decentralized app-like microblogging server/SNS for the Fediverse, using the ActivityPub protocol like GNU social and Mastodon.
  • Spreed

    6.3 0.0 JavaScript
    WebRTC audio/video calls, conferencing server, and web client.
  • Friendica

    6.3 9.9 L1 PHP
    Social Communication Server.
  • Thredded

    6.3 7.2 L5 Ruby
    Forums, feature-rich and simple.
  • Node-Chat

    6.2 1.7 L2 JavaScript
    A not-so-basic open-source chat with admin features.
  • Movim

    6.2 9.4 L3 PHP
    A brand new social network, full of awesome features in a modern and smart interface.
  • OSSN

    6.2 9.4 L3 PHP
    Open Source Social Network
  • wildduck

    6.1 8.5 JavaScript
    Scalable no-SPOF IMAP/POP3 mail server.
  • InspIRCd

    6.1 9.3 C++
    Modular IRC server written in C++ for Linux, BSD, Windows, and macOS.
  • 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.
  • Homer

    5.8 6.7 Shell
    Troubleshooting & Monitoring VOIP calls
  • Glowing Bear

    5.8 7.7 JavaScript
    A web frontend for WeeChat.
  • Freenet

    5.7 7.4 L1 Java
    Anonymously share files, browse and publish "freesites"
  • JSXC

    5.7 8.1 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.
  • Quassel IRC

    5.6 6.5 L1 C++
    distributed IRC client, meaning that one
  • Broid

    5.6 0.0 JavaScript
    Broid enables rich conversations on all messaging channels within a single schema integration using W3C standards.
  • Talkyard

    5.6 9.0 Scala
    Create a community, where your users can suggest ideas and get questions answered. And have friendly open-ended discussions and chat
  • Scrollback

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

    5.4 4.7 L1 Java
    Kontalk is an Open Source Messenger, similar to WhatsApp
  • IRCAnywhere

    5.4 0.0 L4 JavaScript
    Open-source self-hosted alternative to IRCCloud.
  • Simple Machines Forum

    5.4 9.5 PHP
    Free, professional grade software package that allows you to set up your own online community within minutes.

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