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.

opensource-socialnetwork

Open Source Social Network (OSSN) is a powerful open-source social networking software developed in PHP. It enables you to create a fully functional social networking website that fosters community engagement and helps your members form meaningful social relationships.

Social Network

roundcubemail

The Roundcube Webmail suite

Webmail Client

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

quassel

Quassel IRC: Chat comfortably. Everywhere.

IRC

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

react-native-gifted-chat

💬 The most complete chat UI for React Native

Chat

meet

Open source video conferencing app powered by LiveKit. Built with Django and React.

video conferencing

asterisk

The official Asterisk Project repository.

PBX

openvidu

OpenVidu Platform main repository

WebRTC

dittofeed

Open-source customer engagement. Automate transactional and marketing messages across email, SMS, mobile push, WhatsApp, Slack, and more 📨

Email Marketing

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

openmeetings

Mirror of Apache Openmeetings

Video Conferencing

unrealircd

Official UnrealIRCd repository. Downloads are available from our site

IRC server

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

synapse

Synapse: Matrix homeserver written in Python/Twisted + Rust

Matrix

bigbluebutton

A complete web conferencing system for virtual classes and more!

Web Conferencing

keila

Open Source Newsletter Tool.

Newsletter

discourse

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

Forum Software

ejabberd

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

XMPP

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

simplex-chat

SimpleX - the first messaging network operating without user identifiers of any kind - 100% private by design! iOS, Android and desktop apps 📱!

end-to-end encryption