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100 Communication systems software solutions and projects

  • Discourse

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

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

    9.8 9.7 L1 JavaScript
    Open-source, on-prem Slack-alternative. It can be integrated with Gitlab.
  • Scout APM uses tracing logic that ties bottlenecks to source code so you know the exact line of code causing performance issues and can get back to building a great product faster.
    Promoted scoutapm.com
  • Mastodon

    9.8 9.8 L5 Ruby
    A GNU Social-compatible microblogging server
  • Jitsi Meet

    9.8 9.7 L4 JavaScript
    Jitsi Meet is an OpenSource
  • ZeroNet

    9.7 8.7 Python
    Open, free, and uncensorable websites, using Bitcoin cryptography and BitTorrent network.
  • Symphony

    9.7 9.4 L1 Java
    A modern community
  • Reddit

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

    9.7 10.0 L2 Python
    Zulip is a powerful, open source group chat application.
  • NodeBB

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

    9.6 8.1 L4 Ruby
    Distributed social networking server.
  • Flarum

    9.5 4.7 ApacheConf
    Delightfully simple forums. Flarum is the next-generation forum software that makes online discussion fun again.
  • Telescope

    9.3 8.9 JavaScript
    An open-source social news app built with Meteor.
  • Postal

    9.3 6.1 Ruby
    A fully featured open source mail delivery platform for incoming & outgoing e-mail
  • Lets-Chat

    9.3 0.0 L5 JavaScript
    A self hosted chat suite written in Node.
  • Mail-in-a-Box

    9.3 8.0 L3 Python
    Turns any Ubuntu server into a fully functional mail server with one command.
  • Tox

    9.3 0.0 L3 C
    A distributed, secure messenger with audio and video chat capabilities.
  • Mailpile

    9.2 5.3 L2 Python
    Webmail client with search, filtering, encryption features and more.
  • Synapse

    9.1 9.8 L3 Python
    A server for Matrix, an open standard for decentralized persistent communication.
  • docker-mailserver

    9.0 8.8 Shell
    A fullstack but simple mail server
  • MailHog

    9.0 1.6 Go
    Small Golang executable which runs an SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development.
  • HumHub

    9.0 9.7 L4 PHP
    A flexible kit for private social networks.
  • Vector

    8.8 9.7 L4 JavaScript
    A glossy Matrix web client with an emphasis on performance and usability.
  • Mautic

    8.8 9.7 L2 PHP
    Mautic is marketing automation software
  • ejabberd

    8.8 8.9 Erlang
    XMPP instant messaging server.
  • Tinode

    8.7 9.4 Go
    Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots.
  • Roundcube

    8.6 9.1 L3 PHP
    Browser-based IMAP client with an application-like user interface.
  • Mailtrain

    8.5 2.1 HTML
    self hosted newsletter application built on Node.js
  • Centrifugo

    8.5 8.1 Go
    Language-agnostic real-time messaging
  • MailCatcher

    8.5 3.0 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.
  • Mumble

    8.4 9.4 L1 C++
    Low-latency, high quality voice/text chat software.
  • Gotify

    8.4 6.8 Go
    Self-hosted notification server with Android and CLI clients, similar to PushBullet.
  • Haraka

    8.3 6.8 L3 JavaScript
    A high-performance, pluginable SMTP server written in JavaScript.
  • The Lounge

    8.3 9.0 L4 JavaScript
    The self-hosted web IRC client.
  • Mail For Good

    8.3 0.1 JavaScript
    An open source email campaign management tool for nonprofits.
  • Isso

    8.3 5.9 L4 Python
    A lightweight commenting server written in Python and JavaScript. It aims to be a drop-in replacement for Disqus.
  • Openfire

    8.3 9.2 L1 Java
    Real time collaboration
  • RainLoop

    8.2 3.6 L3 PHP
    Simple, modern & fast webmail with IMAP/SMTP Support and multi accounting.
  • Lemmy

    8.2 9.8 Rust
    A link aggregator / reddit clone for the fediverse. Reddit alternative built in Rust.
  • Tutanota makes encryption easy

    8.1 9.5 JavaScript
    Tutanota is the end-to-end encrypted mail client that enables you to communicate securely with anyone.
  • Listmonk

    8.1 8.5 Go
    High performance, self-hosted newsletter and mailing list manager with a modern dashboard.
  • Shout

    8.0 2.8 L4 JavaScript
    The self-hosted web IRC client.
  • Bootcamp

    8.0 5.4 JavaScript
    An enterprise social network.
  • Converse.js

    8.0 9.5 L2 JavaScript
    A free and open-source XMPP chat client in your browser.
  • Friends

    7.9 0.0 L4 JavaScript
    P2P chat powered by the web.
  • Patchwork

    7.9 7.3 JavaScript
    Decentralized messaging and sharing app built on top of Secure Scuttlebutt
  • Jitsi Video Bridge

    7.9 9.1 L1 Java
    WebRTC compatible Selective Forwarding Unit
  • ProtonMail Web Client

    7.8 7.8 JavaScript
    Official AngularJS web client for the ProtonMail secure email service.
  • Kandan

    7.8 0.0 JavaScript
    Kandan is an Open Source Alternative to HipChat.
  • Vanilla Forums

    7.8 9.8 L2 PHP
    Simple and flexible forum software.
  • 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.
  • Mailu

    7.6 8.4 Python
    Mailu is a simple yet full-featured mail server as a set of Docker images.
  • formspree

    7.6 0.0 L3 Python
    Easy HTML form without PHP or JavaScript
  • PixelFed

    7.6 9.5 PHP
    Pixelfed is an open-source, federated platform alternate to Instagram.
  • flaskbb

    7.5 4.8 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.
  • hack.chat

    7.5 0.0 L3 JavaScript
    A minimal, distraction-free chat application.
  • phpBB

    7.5 9.4 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.
  • Misago

    7.4 2.9 Python
    Misago is fully featured modern forum application that is fast, scalable and responsive.
  • Pump.io

    7.4 5.4 L4 JavaScript
    Stream server that does most of what people really want from a social network.
  • TextBelt

    7.4 1.7 L3 JavaScript
    An outgoing SMS API that uses carrier-specific gateways to deliver your text messages for free, and without ads.
  • Elgg

    7.4 8.3 L3 PHP
    A powerful open source social networking engine.
  • remark42

    7.4 8.8 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.
  • Kamailio

    7.3 9.8 L2 C
    Modular SIP server
  • ZNC

    7.3 8.4 L1 C++
    An advanced IRC bouncer.
  • Live Helper Chat

    7.3 9.7 L3 PHP
    Live Support chat for your website.
  • Papercups

    7.2 9.5 Elixir
    An open source live customer chat web app written in Elixir.
  • Weechat

    7.2 9.1 L1 C
    A fast, light and extensible chat client.
  • MongooseIM

    7.1 9.7 Erlang
    Fork of ejabberd.
  • Hubl.in

    7.1 1.6 L3 JavaScript
    WebRTC powered video conference, chat and collaborative editor.
  • Asterisk

    7.0 8.9 L2 C
    An easy to use but advanced IP PBX system, VoIP gateway and conference server.
  • Modoboa

    7.0 8.5 L5 Python
    Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.
  • Coral

    6.9 9.2 TypeScript
    A better commenting experience from Vox Media.
  • twister

    6.9 2.6 L1 C++
    Fully decentralized P2P microblogging platform leveraging the free software implementations of Bitcoin and BitTorrent protocols.
  • Candy

    6.9 1.5 L3 JavaScript
    Multi user XMPP client written in Javascript.
  • 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

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

    6.6 9.7 L1 C++
    Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.
  • Misskey

    6.6 9.7 TypeScript
    Decentralized app-like microblogging server/SNS for the Fediverse, using the ActivityPub protocol like GNU social and Mastodon.
  • Kazoo

    6.6 7.8 Erlang
    KAZOO is an open-source, highly scalable software platform designed to provide carrier-grade VoIP switch functions and features.
  • Node-Chat

    6.5 0.6 L2 JavaScript
    A not-so-basic open-source chat with admin features.
  • Spreed

    6.5 0.0 JavaScript
    WebRTC audio/video calls, conferencing server, and web client.
  • OSSN

    6.4 9.3 L3 PHP
    Open Source Social Network
  • MyBB

    6.4 8.4 L1 PHP
    Free, extensible forum software package.
  • Thredded

    6.4 5.2 L5 Ruby
    Forums, feature-rich and simple.
  • Friendica

    6.4 9.9 L1 PHP
    Social Communication Server.
  • FusionPBX

    6.3 9.8 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.
  • Movim

    6.3 9.2 L3 PHP
    A brand new social network, full of awesome features in a modern and smart interface.
  • wildduck

    6.3 8.6 JavaScript
    Scalable no-SPOF IMAP/POP3 mail server.
  • InspIRCd

    6.2 9.0 C++
    Modular IRC server written in C++ for Linux, BSD, Windows, and macOS.
  • Talkyard

    6.0 8.8 Scala
    Create a community, where your users can suggest ideas and get questions answered. And have friendly open-ended discussions and chat
  • Homer

    6.0 5.0 Shell
    Troubleshooting & Monitoring VOIP calls
  • Oragono

    6.0 9.8 Go
    Modern IRCv3 server written in Go, combining the features of an ircd, a services framework, and a bouncer.
  • Mailman

    5.9 0.0 L5 Ruby
    The Gnu mailing list server.
  • JSXC

    5.9 7.9 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.
  • Freenet

    5.8 8.3 L1 Java
    Anonymously share files, browse and publish "freesites"
  • Glowing Bear

    5.8 7.5 JavaScript
    A web frontend for WeeChat.
  • Quassel IRC

    5.7 6.7 L1 C++
    distributed IRC client, meaning that one
  • Broid

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

    5.6 5.5 Go
    A simple, private, persistence-free web based multi-room chat server + client.

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