Best Cross-Platform Chat & Communication for self-hosting

Private messenger without any user identifiers

Replaces Signal, WhatsApp

Screen sharing for developers

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

Peer-to-peer encrypted messaging and calls over Tox

Replaces Skype, WhatsApp

All-in-one messenger that combines chat services

Replaces Rambox, Station

Extensible terminal-based chat client

Replaces Slack

Modular terminal IRC client with scripting

Replaces Slack

Peer-to-peer encrypted messaging protocol and core

Replaces Skype, Discord

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

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

Live Support chat for your website

Feature-rich event management system

Replaces Zoho Backstage

Secured and decentralized communication system

Group peer to peer video calls for everyone

Replaces BigBlueButton, Skype

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

Collection of Matrix bridges for popular chat networks

Replaces Beeper

Anonymously share files, browse and publish _freesites_ (web sites

Hosted-anywhere modern web IRC client

Replaces Slack, 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,

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

Onion-routed private messenger with no phone number

Replaces Signal, WhatsApp

Open-source SIP voice, video, and messaging client

Replaces Skype, Zoom

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

Simple, lightweight web-based IRC client

Replaces IRCCloud

Notification server for relaying push notifications via Matrix,

P2P encrypted messaging protocol toolkit

Replaces Signal, WhatsApp

Truly private space for you and your friends

Secure Scuttlebutt room server

IRC without netsplits

XMPP to IRC gateway component

Multi-frontend XMPP communication ecosystem

Replaces Slack, Facebook

Fully distributed, peer-to-peer encrypted communication

Replaces Skype, Zoom

Simple plaintext email send app

Electronic mailing lists manager

Replaces Google Groups

Simple web frontend for Mlmmj mailing list management

Secure Scuttlebutt pub with a web interface for pub management

Replaces Facebook, Instagram

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