10

8

6

4

2


9.7

10.0
Zulip

9.9

10.0
Discourse

7.2

9.9
Loomio

6.2

9.9
Friendica

9.4

9.8
NodeBB

6.2

9.9
FusionPBX

100 Communication systems software solutions and projects

  • Zulip

    9.7 10.0 L2 Python
    Zulip server and web application. Open-source team chat that helps teams stay productive and focused.

  • Discourse

    9.9 10.0 L2 Ruby
    A platform for community discussion. Free, open, simple.

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  • Loomio

    7.2 9.9 L3 Ruby
    Loomio is a collaborative decision making tool

  • Friendica

    6.2 9.9 L1 PHP
    Friendica Communications Platform

  • NodeBB

    9.4 9.8 L2 JavaScript
    Node.js based forum software built for the modern web

  • FusionPBX

    6.2 9.9 PHP
    Official FusionPBX - A full-featured domain based multi-tenant PBX and voice switch for FreeSwitch.

  • Synapse

    9.2 9.9 L3 Python
    Synapse: Matrix homeserver written in Python/Twisted.

  • GNUNet

    2.0 9.8 L2 core is C, apps can be any language
    GNUnet is an alternative network stack for building secure, decentralized and privacy-preserving distributed applications. Our goal is to replace the old insecure Internet protocol stack. Starting from an application for secure publication of files, it has grown to include all kinds of basic protocol components and applications towards the creation of a GNU internet. https://git.gnunet.org/

  • Rocket.Chat

    9.9 9.9 L3 TypeScript
    The communications platform that puts data protection first.

  • Mastodon

    9.9 9.9 L5 Ruby
    Your self-hosted, globally interconnected microblogging community

  • Kamailio

    7.4 9.9 L2 C
    Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms -

  • Vanilla Forums

    7.6 3.9 L2 PHP
    Vanilla is a powerfully simple discussion forum you can easily customize to make as unique as your community.

  • Oragono

    6.4 7.6 Go
    A modern IRC server (daemon/ircd) written in Go.

  • Misskey

    8.3 10.0 TypeScript
    🌎 An interplanetary microblogging platform 🚀

  • 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.

  • Lemmy

    8.5 9.3 Rust
    🐀 A link aggregator and forum for the fediverse

  • Mattermost

    9.8 9.9 L1 TypeScript
    Mattermost is an open source platform for secure collaboration across the entire software development lifecycle.

  • Jitsi Meet

    9.7 9.8 L4 TypeScript
    Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application.

  • Mautic

    8.8 9.9 L2 PHP
    Mautic: Open Source Marketing Automation Software.

  • Dovecot

    5.6 9.8 L3 C
    Dovecot mail server

  • twtxt.net

    4.5 9.3 Go
    📕 twtxt is a Self-Hosted, Twitter™-like Decentralised microBlogging platform. No ads, no tracking, your content, your data!

  • Live Helper Chat

    7.2 8.9 L3 PHP
    Live Helper Chat - live support for your website. Featuring web and mobile apps, Voice & Video & ScreenShare. Supports Telegram, Twilio (whatsapp), Facebook messenger including building a bot.

  • Vector

    9.1 9.8 L4 TypeScript
    A glossy Matrix collaboration client for the web.

  • HumHub

    8.8 9.6 L4 PHP
    HumHub is an Open Source Enterprise Social Network. Easy to install, intuitive to use and extendable with countless freely available modules.

  • MongooseIM

    6.7 9.9 Erlang
    MongooseIM is Erlang Solutions' robust, scalable and efficient XMPP server, aimed at large installations. Specifically designed for enterprise purposes, it is fault-tolerant and can utilise the resources of multiple clustered machines.

  • RetroShare

    6.4 9.3 L1 C++
    RetroShare is a Free and Open Source cross-platform, Friend-2-Friend and secure decentralised communication platform.

  • Papercups

    8.1 1.0 Elixir
    Open-source live customer chat

  • Tutanota makes encryption easy

    8.2 9.9 TypeScript
    Tutanota is an email service with a strong focus on security and privacy that lets you encrypt emails, contacts and calendar entries on all your devices.

  • Mailcow

    8.5 9.0 JavaScript
    mailcow: dockerized - 🐮 + 🐋 = 💕

  • Simple Machines Forum

    5.3 9.4 PHP
    Simple Machines Forum — SMF in short — is free and open-source community forum software, delivering professional grade features in a package that allows you to set up your own online community within minutes!

  • Converse.js

    7.7 8.9 L2 JavaScript
    Web-based XMPP/Jabber chat client written in JavaScript

  • EpochTalk

    2.8 0.0 JavaScript
    Next Generation Forum Software

  • PixelFed

    8.0 9.2 PHP
    Photo Sharing. For Everyone.

  • Symphony

    9.7 9.4 L1 Java
    A modern community

  • Mumble

    8.4 9.7 L1 C++
    Mumble is an open-source, low-latency, high quality voice chat software.

  • SimpleLogin

    7.5 9.4 Python
    The SimpleLogin back-end

  • Human-Connection

    3.7 0.0 JavaScript
    Free and open-source social network for active citizenship.

  • Tinode

    9.1 9.4 Go
    Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots

  • Movim

    6.4 7.6 L3 JavaScript
    Movim - Decentralized social platform

  • OSSN

    6.3 8.2 L3 PHP
    Open Source Social Network (OSSN) is a social networking software written in PHP. It allows you to make a social networking website and helps your members build social relationships, with people who share similar professional or personal interests. It is available in 17 international languages.

  • phpBB

    7.2 9.6 L2 PHP
    phpBB Development: phpBB is a popular open-source bulletin board written in PHP. This repository also contains the history of version 2.

  • Kiwi IRC

    5.4 4.8 Vue
    🥝 Next generation of the Kiwi IRC web client

  • Coral

    6.6 8.9 TypeScript
    A better commenting experience from Vox Media

  • Convos

    5.5 0.0 L4 Perl
    Convos :busts_in_silhouette: is the simplest way to use IRC in your browser [Moved to: https://github.com/convos-chat/convos]

  • Talkyard

    6.0 8.5 TypeScript
    A community discussion platform: Brings together the main features from StackOverflow, Slack, Discourse, Reddit, and Disqus blog comments.

  • Openfire

    8.0 9.5 L1 Java
    An XMPP server licensed under the Open Source Apache License.

  • Exim

    5.2 8.3 L1 C
    Exim Mail Transport Agent - source, testsuite and documentation

  • Weechat

    7.1 9.8 L1 C
    The extensible chat client.

  • Roundcube

    8.5 9.5 L3 PHP
    The Roundcube Webmail suite

  • Jitsi Video Bridge

    7.8 7.9 L1 Kotlin
    Jitsi Videobridge is a WebRTC compatible video router or SFU that lets build highly scalable video conferencing infrastructure (i.e., up to hundreds of conferences per server).

  • ejabberd

    8.6 9.0 Erlang
    Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)

  • InspIRCd

    5.9 9.8 C++
    A modular C++ IRC server (ircd).

  • Shhh

    3.5 4.2 Python
    Share sensitive info without leaving a trace in your chat logs or email accounts.

  • AnsiMail

    2.6 5.8 Jinja
    Fullstack, security focused, personal mail server based on OpenSMTPD for OpenBSD

  • Asterisk

    7.1 9.6 L2 C
    Mirror of the official Asterisk (https://www.asterisk.org) Project repository. No pull requests here please. Use Gerrit:

  • docker-mailserver

    9.0 8.7 Shell
    A fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) using Docker. [Moved to: https://github.com/docker-mailserver/docker-mailserver]

  • Telescope

    9.0 2.5 JavaScript
    🌋 A toolkit to quickly build apps with React, GraphQL & Meteor

  • The Lounge

    8.2 7.9 L4 TypeScript
    💬 ‎ Modern, responsive, cross-platform, self-hosted web IRC client

  • remark42

    7.8 8.3 Go
    comment engine

  • BuddyPress

    4.0 9.1 L2 PHP
    BuddyPress DEVELOPMENT repo. This repository is just a mirror of the development SVN at https://buddypress.svn.wordpress.org/. Please include a link to a pre-existing ticket on https://buddypress.trac.wordpress.org/ with every pull request.

  • ZeroNet

    9.6 0.0 JavaScript
    ZeroNet - Decentralized websites using Bitcoin crypto and BitTorrent network

  • Gosora

    2.7 0.0 Go
    Gosora is an ultra-fast and secure forum software written in Go that balances usability with functionality.

  • Scoold

    5.3 8.6 Java
    A Stack Overflow clone for teams (self-hosted or hosted)

  • Routr

    5.5 6.9 TypeScript
    ⚡ Next-generation programmable SIP Server

  • Satellity

    4.5 0.0 Go
    Yet another open source forum written in Golang, React and PostgreSQL.

  • Modoboa

    7.1 7.2 L5 Python
    Mail hosting made simple

  • wildduck

    6.4 8.3 JavaScript
    Opinionated email server

  • Listmonk

    8.9 8.4 Go
    High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app.

  • Kontalk

    5.0 0.0 L1 Java
    Kontalk official Android client

  • ZNC

    6.9 0.0 L1 C++
    Official repository for the ZNC IRC bouncer

  • Dada Mail

    3.0 9.1 L3 Perl
    Self-Hosted, Full Featured, Email Mailing List Manager. Announcement + Discussion Lists, Web-based Installer, Installs with minimal dependencies, sendmail/SMTP/Amazon SES supported

  • phpList

    5.2 4.2 PHP
    Fully functional Open Source email marketing manager for creating, sending, integrating, and analysing email campaigns and newsletters.

  • MyBB

    6.1 5.0 L1 PHP
    MyBB is a free and open source forum software.

  • Zusam

    2.3 7.6 PHP
    Private groups to share messages, photos, videos, links with friends and family.

  • Mailu

    8.0 7.7 Python
    Insular email distribution - mail server as Docker images

  • WBO

    6.5 6.8 JavaScript
    Online collaborative Whiteboard that is simple, free, easy to use and to deploy

  • Glosa

    1.9 0.9 HTML
    Comments for static sites. Clone of Disqus, but faster, Opensource and sexy.

  • Freenet

    5.6 9.4 L1 Java
    Freenet REference Daemon

  • Elgg

    7.0 9.4 L3 PHP
    A social networking engine in PHP/MySQL

  • OpenSMTPD

    4.5 4.4 L2 C
    This is official OpenSMTPD Portable repository. Forks, pull requests and other contributions are welcome!

  • Cypht

    5.1 5.0 L4 PHP
    Cypht: Lightweight Open Source webmail written in PHP and JavaScript

  • Mail-in-a-Box

    9.2 5.5 L3 Python
    Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.

  • Centrifugo

    8.5 8.0 Go
    Scalable real-time messaging server in a language-agnostic way. Set up once and forever.

  • JSXC

    5.5 1.6 TypeScript
    :speech_balloon: Real-time xmpp chat application with video calls, file transfer and encrypted communication.

  • diaspora*

    9.5 9.3 L4 Ruby
    A privacy-aware, distributed, open source social network.

  • Metronome IM

    2.9 6.4 Lua
    Metronome IM, lightweight xmpp server with advanced microblogging features.

  • homebox

    3.8 0.0 Python
    A set of ansible scripts to build a personal mail server / private cloud / etc.

  • Dispatch

    4.4 0.0 Go
    Web-based IRC client in Go.

  • Kazoo

    6.2 4.3 Erlang
    The core of an open-source, distributed, highly scalable platform designed to provide robust telecom services

  • ProtonMail Web Client

    7.8 10.0 TypeScript
    Monorepo hosting the proton web clients

  • Inboxen

    3.1 0.0 Python
    Main repo for Inboxen.org

  • Glowing Bear

    5.5 4.5 JavaScript
    A web client for WeeChat

  • Spectrum 2

    4.2 4.4 C++
    Spectrum 2 IM transports

  • Patchwork

    7.9 8.6 JavaScript
    A decentralized messaging and sharing app built on top of Secure Scuttlebutt (SSB).

  • AnonAddy

    6.6 2.8 PHP
    Anonymous email forwarding

  • Anahita

    4.8 7.4 L3 PHP
    Anahita is a platform and framework for developing open science and knowledge sharing applications on a social networking foundation.

  • Darkwire.io

    5.0 0.0 JavaScript
    End-to-end encrypted instant web chat

  • ngircd

    4.0 0.0 C
    Free, portable and lightweight Internet Relay Chat server

  • PushBits

    2.8 5.8 Go
    A simple server for push notifications via Matrix (and a minimalistic alternative to Pushover and Gotify with a strong focus on security) 🚀📯

  • Haraka

    8.0 6.6 L3 JavaScript
    A fast, highly extensible, and event driven SMTP server
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