Chat & Communication

Open-source customer engagement and live-chat platform

Replaces Intercom, Zendesk

Private messenger without any user identifiers

Replaces Signal, WhatsApp

Real-time collaborative document editor

Replaces Google Docs

Scalable real-time messaging server for apps and websites

Replaces Pusher, Firebase Realtime Database

Screen sharing for developers

Conversational app builder (alternative to Typeform and Landbot)

Peer-to-peer messaging app that works offline

Replaces WhatsApp, Signal

Low-latency, high-quality voice chat application

Replaces Discord, TeamSpeak

Modern, self-hosted web IRC client

Replaces IRCCloud, Slack

Open-source live chat and customer messaging

Replaces Intercom, Drift

Web-based helpdesk and customer support system

Replaces Zendesk, Freshdesk

Virtual office / virtual conference application presented as a 16-bit

Self-hostable WebSocket server compatible with Pusher

Replaces Pusher

Privacy-focused lightweight commenting engine

Replaces Disqus

Lightweight self-hosted commenting server

Replaces Disqus

Scalable software telephony platform

Replaces Twilio, Asterisk

Peer-to-peer encrypted messaging and calls over Tox

Replaces Skype, WhatsApp

Free WebRTC video conferencing and meeting rooms

Replaces Zoom, Google Meet

All-in-one messenger that combines chat services

Replaces Rambox, Station

Free self-hosted help desk and shared inbox

Replaces Help Scout, Zendesk

Self-hosted local Telegram Bot API server

Minimal collaborative real-time text editor

Replaces Google Docs, Etherpad

Open-source framework for building telephony systems

Replaces Avaya, Cisco Unified Communications

Extensible terminal-based chat client

Replaces Slack

Modern IRC server with IRCv3 and bouncer features

Replaces Slack, Discord

Modular terminal IRC client with scripting

Replaces Slack

XMPP gateway providing phone-number based messaging

Replaces WhatsApp, Signal

High-performance SIP server for VoIP infrastructure

Replaces Twilio

Lightweight, privacy-friendly embeddable comment system

Replaces Disqus

Peer-to-peer encrypted messaging protocol and core

Replaces Skype, Discord

Stoat is a user-first chat platform built with modern web technologies

Real-time WebSocket server for in-app messaging

Replaces Pusher, Ably

Peer-to-peer chat app that is serverless, decentralized, and ephemeral

Live Support chat for your website

Self-hostable, open-source Discord-compatible chat backend

Replaces Discord

Chat, video calls and webinars integrated into Nextcloud

Replaces Slack, Zoom

Feature-rich event management system

Replaces Zoho Backstage

Secured and decentralized communication system

Troubleshooting and monitoring VoIP calls

Group peer to peer video calls for everyone

Replaces BigBlueButton, Skype

Matrix-Telegram puppeting bridge

Replaces Telegram official client

Lightweight SIP proxy, location server, and registrar for a reliable

Whistleblowing software enabling anyone to easily set up and maintain

SIP proxy/server for voice, video, IM, presence and any other SIP

Collection of Matrix bridges for popular chat networks

Replaces Beeper

Federated, end-to-end encrypted messaging service for the web, iOS,

Lightweight videoconferencing server

Replaces Zoom, Google Meet

Modular C++ Internet Relay Chat daemon

Replaces Slack, Discord

JavaScript-based multi-user XMPP chat client

Replaces Chatango

Terminal-based client for the Tox messaging network

Replaces Skype, WhatsApp

Anonymously share files, browse and publish _freesites_ (web sites

Multi-tenant web GUI for FreeSWITCH

Replaces 3CX, RingCentral

User-friendly IRC bouncer with multi-network support

Replaces IRCCloud

Hosted-anywhere modern web IRC client

Replaces Slack, Discord

Web front end for the WeeChat IRC relay

Replaces IRCCloud, Slack

Federated social networking toolkit for communities

Replaces Facebook Groups, Discord

Conference management software

Replaces Zoho Backstage

Decentralized messenger built on top of email

Replaces WhatsApp, Signal

Multichannel notification server with support for Email, Mobile Push,

Messaging platform operating without user identifiers

Peer-to-peer encrypted messaging that works offline

Replaces Signal, WhatsApp

Distributed IRC client with an always-on core

Replaces Slack

One-Time-Secret sharing platform with a symmetric 256bit AES

Command-line tool for sending and receiving Matrix messages

Replaces Slack CLI

Browser-based client for Mumble voice servers

Replaces Discord, TeamSpeak

Privacy-friendly, self-hosted web comments engine

Replaces Disqus

IRC gateway to instant messaging networks

Replaces Pidgin

Lightweight Unix IRC server that is easy to configure

Replaces Slack

Self-hosted multi-room chat with markdown and code blocks

Replaces Discord, Slack

Onion-routed private messenger with no phone number

Replaces Signal, WhatsApp

Scalable signaling backend for Nextcloud Talk

Replaces Zoom

Highly configurable open-source IRC server

Replaces Slack, Discord

Real-time cam-2-cam video calls & screen sharing, end-to-end

Bridge connecting Matrix rooms to IRC channels

Replaces Slack IRC gateway

Open-source SIP voice, video, and messaging client

Replaces Skype, Zoom

Minimal email server tuned for Delta Chat messaging

Replaces WhatsApp, Signal

Matrix bridge for GitHub, GitLab, Jira and webhooks

Replaces Slack

Modular IRC services framework for large networks

Replaces Slack

Self-hosted sticker picker widget for Matrix

Replaces Telegram stickers

Transport and gateway framework for messaging networks

Replaces Bitlbee

Keep secrets out of emails or chat logs, share them using secure links

Simple, lightweight web-based IRC client

Replaces IRCCloud

Self-hosted name registry and bridge for the Jami network

Replaces Skype, Zoom

Server for unified push support in Molly chat application

Notification server for relaying push notifications via Matrix,

IRC services suite for nickname and channel registration

Replaces Slack

E2E-encrypted personal-server messaging app

Replaces Discord, Slack

Bouncer-style Matrix to IRC bridge

Replaces ZNC

XMPP library for building bots and chat extensions

Replaces Slack apps

Self-hosted backend for syncing Ferdium settings

Replaces Franz Server

IRCv3 server daemon used by Libera.Chat

Replaces Slack, Discord

P2P encrypted messaging protocol toolkit

Replaces Signal, WhatsApp

Moderation bot for Matrix communities

Replaces Discord moderation bots

Self-hosted AI assistant bot for Matrix rooms

Replaces Slack AI assistants

Standalone media storage for Matrix homeservers

Replaces Slack file storage

IRC server daemon for large networks

Replaces Discord, Slack

Truly private space for you and your friends

Federated commenting system built on Matrix

Replaces Disqus

Lightweight and stable IRC server daemon

Replaces Slack, Discord

Secure Scuttlebutt room server

IRC without netsplits

Complete, modular and scalable SIP server, includes a push gateway, to

Next-Gen self-hosted chat server and clients

XMPP to IRC gateway component

Matrix bot that generates news summaries from chat

Replaces Slack workflows

IRC server daemon used by the Undernet network

Replaces Discord, Slack

Multi-frontend XMPP communication ecosystem

Replaces Slack, Facebook

Fully distributed, peer-to-peer encrypted communication

Replaces Skype, Zoom

Continuously relays a remote IMAP inbox into a YunoHost mailbox

Bot which enables multiple Matrix users to use a single third-party IM

Simple plaintext email send app

Electronic mailing lists manager

Replaces Google Groups

Simple and efficient mailing list manager

Simple web frontend for Mlmmj mailing list management

Secure Scuttlebutt pub with a web interface for pub management

Replaces Facebook, Instagram

Platform for your corporate communications, based on the advanced

Alternative private mail system - web-based, end-to-end encrypted by

Full-featured PABX system, with call queues, built-in web

Online whiteboard, audio/video conferencing, screen sharing, shared

Full-featured IPBX solution built atop Asterisk with integrated Web

Transit class4 softswitch(SBC) with integrated billing and routing

Web-based open source GUI that controls and manages Asterisk

Software framework for decentralized, peer-to-peer networking

VoIP troubleshooting and monitoring platform