AnyCable source
Realtime server for reliable two-way communication over WebSockets, Server-sent events, etc.
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Self-hosted Communication - Custom Communication Systems software (2026)
[Communication software](https://en.wikipedia.org/wiki/Communication_software) used to provide remote access to systems and exchange files and messages in text, audio and/or video formats between different computers or users, using their own custom protocols.
37 open-source apps · all free & self-hostable
Apprise
Apprise allows you to send a notification to almost all of the most popular notification services available to us today such as: Telegram, Discord, Slack, Amazon SNS, Gotify, etc.
Centrifugo source
Language-agnostic real-time messaging (Websocket or SockJS) server.
Chitchatter source
Peer-to-peer chat app that is serverless, decentralized, and ephemeral.
Conduit source
A simple, fast, and reliable chat server powered by Matrix.
Continuwuity source
Community-driven Matrix homeserver, the continuation of conduwuit focusing on user experience and new features (fork of Conduit).
Databag
Federated, end-to-end encrypted messaging service for the web, iOS, and Android, supporting text, photos, video, and WebRTC video and audio calls.
Element source
Fully-featured Matrix client for Web, iOS & Android.
GlobaLeaks source
Whistleblowing software enabling anyone to easily set up and maintain a secure reporting platform.
GNUnet source
Software framework for decentralized, peer-to-peer networking.
Gotify source
Notification server with Android and CLI clients (alternative to PushBullet).
Hyphanet source
Anonymously share files, browse and publish _freesites_ (web sites accessible only through Hyphanet) and chat on forums.
Jami source
Universal communication platform which preserves the user's privacy and freedoms.
Live Helper Chat source
Live Support chat for your website.
Mumble source
Low-latency, high quality voice/text chat software.
Notifo
Multichannel notification server with support for Email, Mobile Push, Web Push, SMS, messaging and a javascript plugin.
Novu source
Notification infrastructure for developers.
ntfy source
Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.
One Time Secret source
Share sensitive information securely with self-destructing links that are only viewable once.
OTS source
One-Time-Secret sharing platform with a symmetric 256bit AES encryption in the browser.
PushBits
Notification server for relaying push notifications via Matrix, similar to PushBullet and Gotify.
RetroShare source
Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.
Rocket.Chat source
Communications platform that puts data protection first (alternative to Gitter.im and Slack).
SAMA source
Next-Gen self-hosted chat server and clients.
Screego source
Screego is a simple tool to quickly share your screen to one or multiple people via web browser.
Shhh
Keep secrets out of emails or chat logs, share them using secure links with passphrase and expiration dates.
SimpleX Chat
The most private and secure chat and applications platform - now with double ratchet E2E encryption.
Spectrum 2 source
Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks.
Stoat source
Stoat is a user-first chat platform built with modern web technologies.
Synapse source
Server for Matrix, an open standard for decentralized persistent communication.
Tiledesk source
All-in-one customer engagement platform from lead-gen to post-sales, from WhatsApp to your website. With omni-channel live agents and AI-powered chatbots (alternative to Intercom, Zendesk, Tawk.to and Tidio).
Tinode source
Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots.
Tox source
Distributed, secure messenger with audio and video chat capabilities.
Tuwunel source
High-performance and feature-rich chat server for Matrix, and the successor to conduwuit (fork of Conduit).
Typebot source
Conversational app builder (alternative to Typeform and Landbot).
WBO
Web Whiteboard to collaborate in real-time on schemas, drawings, and notes.
Zulip source
Zulip is a powerful, open source group chat application.