10

8

6

4

2


9.9

10.0
Discourse

9.9

9.9
Rocket.Chat

9.8

9.9
Jitsi Meet

9.8

9.4
Mattermost

9.8

9.8
Mastodon

9.7
0.0
Reddit

100 Communication systems software solutions and projects

  • Discourse

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

  • Rocket.Chat

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

    • Promo

  • Jitsi Meet

    9.8 9.9 L4 JavaScript
    Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application.

  • Mattermost

    9.8 9.4 L1 Go
    Open source Slack-alternative in Golang and React - Mattermost

  • Mastodon

    9.8 9.8 L5 Ruby
    Your self-hosted, globally interconnected microblogging community

  • Reddit

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

  • Symphony

    9.7 9.4 L1 Java
    A modern community

  • Zulip

    9.7 10.0 L2 Python
    Zulip server and web app—powerful open source team chat

  • ZeroNet

    9.7 5.2 JavaScript
    ZeroNet - Decentralized websites using Bitcoin crypto and BitTorrent network

  • diaspora*

    9.6 8.6 L4 Ruby
    A privacy-aware, distributed, open source social network.

  • NodeBB

    9.5 9.9 L2 JavaScript
    Node.js based forum software built for the modern web

  • Flarum

    9.4 4.4 PHP
    Simple forum software for building great communities.

  • Lets-Chat

    9.3 0.0 L5 JavaScript
    Self-hosted chat app for small teams

  • Mail-in-a-Box

    9.3 7.8 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.

  • Postal

    9.2 8.3 Ruby
    ✉️ A fully featured open source mail delivery platform for incoming & outgoing e-mail

  • Telescope

    9.2 8.3 JavaScript
    🌋 A toolkit to quickly build apps with React, GraphQL & Meteor

  • Tox

    9.2 0.0 L3 C
    The future of online communications.

  • Chatwoot

    9.2 9.7 Ruby
    Open-source customer engagement suite, an alternative to Intercom, Zendesk, Salesforce Service Cloud etc. 🔥💬

  • MailHog

    9.1 0.0 Go
    Web and API based SMTP testing

  • Mailpile

    9.1 0.7 L2 Python
    A free & open modern, fast email client with user-friendly encryption and privacy features

  • Synapse

    9.1 9.9 L3 Python
    Synapse: Matrix reference homeserver

  • Tinode

    9.1 9.3 Go
    Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots

  • 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]

  • Vector

    9.0 9.8 L4 TypeScript
    A glossy Matrix collaboration client for the web.

  • HumHub

    8.9 9.7 L4 PHP
    HumHub is an Open Source Enterprise Social Network. Easy to install, intuitive to use and extendable with countless freely available modules.

  • Mautic

    8.8 9.8 L2 PHP
    Mautic: Open Source Marketing Automation Software.

  • ejabberd

    8.8 9.5 Erlang
    Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)

  • Roundcube

    8.6 9.6 L3 PHP
    The Roundcube Webmail suite

  • Gotify

    8.6 6.1 Go
    A simple server for sending and receiving messages in real-time per WebSocket. (Includes a sleek web-ui)

  • Listmonk

    8.6 9.1 Go
    High performance, self-hosted newsletter and mailing list manager with a modern dashboard. Single binary app.

  • Mailtrain

    8.5 7.6 JavaScript
    Self hosted newsletter app

  • Centrifugo

    8.5 7.5 Go
    Scalable real-time messaging server in a language-agnostic way. Set up once and forever.

  • Mumble

    8.5 9.8 L1 C++
    Mumble is an open-source, low-latency, high quality voice chat software.

  • MailCatcher

    8.5 8.1 L5 Ruby
    Catches mail and serves it through a dream.

  • Lemmy

    8.4 9.6 Rust
    🐀 Building a federated alternative to reddit in rust

  • Mailcow

    8.4 9.6 PHP
    mailcow: dockerized - 🐮 + 🐋 = 💕

  • The Lounge

    8.3 8.7 L4 JavaScript
    💬 ‎ Modern, responsive, cross-platform, self-hosted web IRC client

  • Mail For Good

    8.3 0.0 JavaScript
    An open source email campaign management tool for nonprofits

  • Haraka

    8.2 6.3 L3 JavaScript
    A fast, highly extensible, and event driven SMTP server

  • Tutanota makes encryption easy

    8.2 9.8 JavaScript
    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.

  • Openfire

    8.2 9.1 L1 Java
    An XMPP server licensed under the Open Source Apache License.

  • RainLoop

    8.2 6.3 L3 PHP
    Simple, modern & fast web-based email client

  • Actor

    8.2 0.0 L2 Java
    Actor Messaging platform

  • Isso

    8.2 6.8 L4 Python
    a Disqus alternative

  • Papercups

    8.1 9.5 Elixir
    Open-source live customer chat

  • Shout

    7.9 0.0 L4 JavaScript
    Deprecated. See fork @ https://github.com/thelounge

  • Friends

    7.9 0.0 L4 JavaScript
    P2P chat powered by the web.

  • Jitsi Video Bridge

    7.9 8.9 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).

  • Patchwork

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

  • ProtonMail Web Client

    7.9 10.0 TypeScript
    Monorepo hosting the proton web clients

  • Bootcamp

    7.9 0.0 CSS
    An enterprise social network

  • Converse.js

    7.9 9.2 L2 JavaScript
    Web-based XMPP/Jabber chat client written in JavaScript

  • Vanilla Forums

    7.8 6.0 L2 PHP
    Vanilla is a powerfully simple discussion forum you can easily customize to make as unique as your community.

  • Mailu

    7.8 9.1 Python
    Insular email distribution - mail server as Docker images

  • PixelFed

    7.7 9.8 PHP
    Photo Sharing. For Everyone.

  • Kandan

    7.7 0.0 JavaScript
    Kandan is an Open Source Alternative to HipChat

  • remark42

    7.6 9.5 Go
    comment engine

  • flaskbb

    7.5 8.8 L4 Python
    A classic Forum Software in Python using Flask.

  • Loomio

    7.5 9.9 L3 Ruby
    Loomio helps people make decisions together

  • formspree

    7.5 0.0 L3 Python
    Easy HTML form without PHP or JavaScript

  • hack.chat

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

  • Kamailio

    7.4 9.8 L2 C
    Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms -

  • phpBB

    7.4 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.

  • TextBelt

    7.4 2.8 L3 JavaScript
    Free API for outgoing SMS

  • Misago

    7.4 0.0 Python
    Misago is fully featured modern forum application that is fast, scalable and responsive.

  • Live Helper Chat

    7.4 9.8 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.

  • Pump.io

    7.3 5.0 L4 JavaScript
    Social server with an ActivityStreams API

  • Elgg

    7.3 7.3 L3 PHP
    A social networking engine in PHP/MySQL

  • ZNC

    7.2 6.9 L1 C++
    Official repository for the ZNC IRC bouncer

  • Weechat

    7.2 9.7 L1 C
    The extensible chat client.

  • Asterisk

    7.1 9.3 L2 C
    Mirror of the official Asterisk (https://www.asterisk.org) Project repository. No pull requests here please. Use Gerrit:

  • Misskey

    7.1 9.9 TypeScript
    🌎 A interplanetary communication platform 🚀

  • Hubl.in

    7.1 0.5 L3 JavaScript
    DEPRECATED - An easy and free video conference service based on WebRTC

  • Modoboa

    7.0 8.9 L5 Python
    Mail hosting made simple

  • MongooseIM

    7.0 9.9 Erlang
    MongooseIM is a mobile messaging platform with focus on performance and scalability

  • Coral

    6.9 9.5 TypeScript
    A better commenting experience from Vox Media

  • Candy

    6.8 0.1 L3 JavaScript
    JavaScript-based multi-user chat client for XMPP.

  • twister

    6.7 2.1 L1 C++
    twister core / daemon

  • RetroShare

    6.6 9.5 L1 C++
    RetroShare is a Free and Open Source cross-platform, Friend-2-Friend and secure decentralised communication platform.

  • Node-Chat

    6.6 0.0 L2 JavaScript
    :speech_balloon: Chat application built with NodeJS and Material Design

  • OSSN

    6.6 9.3 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 16 international languages.

  • Kazoo

    6.5 2.0 Erlang
    The core of an open-source, distributed, highly scalable platform designed to provide robust telecom services

  • wildduck

    6.5 9.0 JavaScript
    Opinionated email server

  • SimpleLogin

    6.5 0.0 CSS
    The SimpleLogin back-end

  • Spreed

    6.4 0.0 JavaScript
    WebRTC audio/video call and conferencing server.

  • Movim

    6.4 9.5 L3 JavaScript
    Movim - Decentralized social platform

  • Kaiwa

    6.4 0.0 L4 JavaScript
    [UNMAINTAINED] A modern XMPP Web client

  • Thredded

    6.3 5.0 L5 Ruby
    The best Rails forums engine ever.

  • MyBB

    6.3 9.1 L1 PHP
    MyBB is a free and open source forum software.

  • Friendica

    6.3 9.9 L1 PHP
    Friendica Communications Platform

  • FusionPBX

    6.3 9.8 PHP
    Official FusionPBX - A full-featured domain based multi-tenant PBX and voice switch for FreeSwitch.

  • Homer

    6.2 5.2 Shell
    HOMER - 100% Open-Source SIP / VoIP Packet Capture & Monitoring

  • InspIRCd

    6.2 9.3 C++
    A modular C++ IRC server (ircd).

  • Oragono

    6.2 9.6 Go
    A modern IRC server (daemon/ircd) written in Go.

  • WBO

    6.1 8.7 JavaScript
    Online collaborative Whiteboard that is simple, free, easy to use and to deploy

  • Talkyard

    6.1 9.6 TypeScript
    A community discussion platform: Brings together the main features from StackOverflow, Slack, Discourse, Reddit, and Disqus blog comments.

  • AnonAddy

    6.0 6.7 PHP
    Anonymous email forwarding

  • DebOps

    6.0 9.7 Jinja
    DebOps - Your Debian-based data center in a box

  • Mailman

    5.9 0.0 L5 Ruby
    The Gnu mailing list server.

  • JSXC

    5.8 8.8 TypeScript
    :speech_balloon: Real-time xmpp chat application with video calls, file transfer and encrypted communication.
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