BestCommunicationTools

Open source communication and collaboration tools. Find Slack alternatives like Rocket.Chat, Mattermost, and Zulip, video conferencing platforms like Jitsi Meet and BigBlueButton, customer support tools like Chatwoot, and Matrix-based messaging clients. Keep team conversations secure and under your control.

Openfire

An XMPP server licensed under the Open Source Apache License.

XMPP

chatwoot

Open-source live-chat, email support, omni-channel desk. An alternative to Intercom, Zendesk, Salesforce Service Cloud etc. 🔥💬

Live Chat

misskey

🌎 A completely free and open interplanetary-microblogging platform 🚀

ActivityPub

jitsi-meet

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

video conferencing

Rocket.Chat

The Secure CommsOS™ for mission-critical operations

Chat

mattermost

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

Collaboration

bigbluebutton

A complete web conferencing system for virtual classes and more!

Web Conferencing

tailchat

Next generation noIM application in your own workspace, not only another Slack/Discord/Rocket.chat

Instant Messaging

NodeBB

Node.js based forum software built for the modern web

Real-time Discussions

flarum

Simple forum software for building great communities.

Forum Software

mumble

Mumble is an open-source, low-latency, high quality voice chat software.

Voice Chat

roundcubemail

The Roundcube Webmail suite

Webmail Client

converse.js

Web-based XMPP/Jabber chat written in JavaScript

XMPP

weechat

The extensible chat client.

Chat

kamailio

Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms, focusing on flexibility, security and scalability

SIP

chitchatter

Secure peer-to-peer chat that is serverless, decentralized, and ephemeral

Chat

livehelperchat

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.

Live Chat

sogo

SOGo is a very fast and scalable modern collaboration suite (groupware). It offers calendaring, address book management, and a full-featured Webmail client along with resource sharing and permission handling. It also makes use of documented standards (IMAP, CalDAV, CardDAV, etc.) and thereby provides native connectivity (without plugins) to many clients such as Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning, and a plethora of mobile devices.

Groupware

keila

Open Source Newsletter Tool.

Newsletter

discourse

A platform for community discussion. Free, open, simple.

Forum Software

diaspora

A privacy-aware, distributed, open source social network.

Decentralized

janus-gateway

Janus WebRTC Server

WebRTC

ejabberd

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

XMPP

synapse

Synapse: Matrix homeserver written in Python/Twisted + Rust

Matrix

asterisk

The official Asterisk Project repository.

PBX

humhub

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

Enterprise Social Network

chat

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

Chat Application

znc

Official repository for the ZNC IRC bouncer

IRC Bouncer

opensips

OpenSIPS is a GPL implementation of a multi-functionality SIP Server that targets to deliver a high-level technical solution (performance, security and quality) to be used in professional SIP server platforms.

SIP Server

phpbb

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

Bulletin Board