Communication - Custom Communication Systems#

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.


Software#

This page lists all projects in this category. Use the index of all projects, the sidebar, or click on tags to browse other categories.


AnyCable#

Realtime server for reliable two-way communication over WebSockets, Server-sent events, etc.

Website Source Code Demo

★2054 2025-04-21 Go Docker MIT

Communication - Custom Communication Systems


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.

Website Source Code

★13266 2025-04-30 Python Docker deb MIT

Communication - Custom Communication Systems


Centrifugo#

Language-agnostic real-time messaging (Websocket or SockJS) server.

Website Source Code Demo

★8930 2025-05-04 Go Docker K8S MIT

Communication - Custom Communication Systems


Chitchatter#

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

Website Source Code

★1831 2025-05-01 Nodejs GPL-2.0

Communication - Custom Communication Systems


Conduit#

A simple, fast, and reliable chat server powered by Matrix.

Website Source Code

★? ? Rust Apache-2.0

Communication - Custom Communication Systems


Databag#

Federated, end-to-end encrypted messaging service for the web, iOS, and Android, supporting text, photos, video, and WebRTC video and audio calls.

Website Source Code Demo

★1022 2025-04-13 Docker Apache-2.0

Communication - Custom Communication Systems


Element#

Fully-featured Matrix client for Web, iOS & Android.

Website Source Code

★11712 2025-05-02 Nodejs Apache-2.0

Communication - Custom Communication Systems


GlobaLeaks#

Whistleblowing software enabling anyone to easily set up and maintain a secure reporting platform.

Website Source Code Demo

★1326 2025-05-02 Python deb Docker AGPL-3.0

Communication - Custom Communication Systems


GNUnet#

Software framework for decentralized, peer-to-peer networking.

Website Source Code

★? ? C GPL-3.0

Communication - Custom Communication Systems


Gotify#

Notification server with Android and CLI clients (alternative to PushBullet).

Website Source Code Clients

★12426 2025-04-27 Go Docker MIT

Communication - Custom Communication Systems


Hyphanet#

Anonymously share files, browse and publish freesites (web sites accessible only through Hyphanet) and chat on forums.

Website Source Code

★1066 2025-04-06 Java GPL-2.0

Communication - Custom Communication Systems


Jami#

Free and universal communication platform which preserves the user’s privacy and freedoms (formerly GNU Ring).

Website Source Code

★? ? C++ GPL-3.0

Communication - Custom Communication Systems


Live Helper Chat#

Live Support chat for your website.

Website Source Code

★2056 2025-04-30 PHP Apache-2.0

Communication - Custom Communication Systems


Mattermost#

Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).

Website Source Code

★32449 2025-05-02 Go Docker K8S AGPL-3.0 Apache-2.0

Communication - Custom Communication Systems


MiAOU#

Multi-room persistent chat server.

Website Source Code

★546 2024-11-10 Nodejs MIT

Communication - Custom Communication Systems


Mumble#

Low-latency, high quality voice/text chat software.

Website Source Code Clients

★6865 2025-05-04 C++ deb BSD-3-Clause

Communication - Custom Communication Systems


Notifo#

Multichannel notification server with support for Email, Mobile Push, Web Push, SMS, messaging and a javascript plugin.

Website Source Code

★809 2025-04-02 C# MIT

Communication - Custom Communication Systems


Novu#

Self-hosted / cloud notification infrastructure for developers.

Website Source Code

★36874 2025-05-04 Docker Nodejs MIT

Communication - Custom Communication Systems


ntfy#

Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.

Website Source Code Clients Demo

★22583 2024-09-29 Go Docker K8S Apache-2.0 GPL-2.0

Communication - Custom Communication Systems


One Time Secret#

Share sensitive information securely with self-destructing links that are only viewable once.

Website Source Code Demo

★2341 2025-05-04 Docker Ruby Nodejs MIT

Communication - Custom Communication Systems


OTS#

One-Time-Secret sharing platform with a symmetric 256bit AES encryption in the browser.

Website Source Code

★542 2025-05-02 Go Apache-2.0

Communication - Custom Communication Systems


PushBits#

Self-hosted notification server for relaying push notifications via Matrix, similar to PushBullet and Gotify.

Website Source Code

★338 2025-02-22 Go ISC

Communication - Custom Communication Systems


RetroShare#

Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.

Website Source Code

★1806 2025-04-27 C++ GPL-2.0

Communication - Custom Communication Systems


Revolt#

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

Website Source Code

★1321 2025-04-25 Rust AGPL-3.0

Communication - Custom Communication Systems


Rocket.Chat#

Teamchat solution similar to Gitter.im or Slack.

Website Source Code

★42571 2025-05-02 Nodejs Docker K8S MIT

Communication - Custom Communication Systems


SAMA#

Next-Gen self-hosted chat server and clients.

Website Source Code Clients Demo

★119 2025-04-25 Nodejs Docker GPL-3.0

Communication - Custom Communication Systems


Screego#

Screego is a simple tool to quickly share your screen to one or multiple people via web browser.

Website Source Code Demo

★8505 2025-04-24 Docker Go GPL-3.0

Communication - Custom Communication Systems


Shhh#

Keep secrets out of emails or chat logs, share them using secure links with passphrase and expiration dates.

Website Source Code

★399 2025-04-23 Python MIT

Communication - Custom Communication Systems


SimpleX Chat#

The most private and secure chat and applications platform - now with double ratchet E2E encryption.

Website Source Code

★8479 2025-04-25 Haskell AGPL-3.0

Communication - Custom Communication Systems


Spectrum 2#

Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks.

Website Source Code

★411 2024-10-09 C++ GPL-3.0

Communication - Custom Communication Systems


Synapse#

Server for Matrix, an open standard for decentralized persistent communication.

Website Source Code

★2349 2025-05-02 Python deb Apache-2.0

Communication - Custom Communication Systems


Syndie#

Syndie is a libre system for operating distributed forums.

Website Source Code

★? ? Java CC0-1.0

Communication - Custom Communication Systems


Tailchat#

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

Website Source Code Demo

★3223 2025-04-12 Docker K8S Nodejs Apache-2.0

Communication - Custom Communication Systems


Tiledesk#

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).

Website Source Code

★215 2025-04-18 Docker K8S MIT

Communication - Custom Communication Systems


Tinode#

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

Website Source Code Clients Demo

★12462 2025-04-15 Go GPL-3.0

Communication - Custom Communication Systems


Tox#

Distributed, secure messenger with audio and video chat capabilities.

Website Source Code

★2396 2025-03-31 C GPL-3.0

Communication - Custom Communication Systems


Typebot#

Conversational app builder (alternative to Typeform or Landbot).

Website Source Code

★8543 2025-05-02 Docker AGPL-3.0

Communication - Custom Communication Systems


WBO#

Web Whiteboard to collaborate in real-time on schemas, drawings, and notes.

Website Source Code Demo

★2337 2025-04-14 Nodejs Docker AGPL-3.0

Communication - Custom Communication Systems


Zulip#

Zulip is a powerful, open source group chat application.

Website Source Code

★22741 2025-05-02 Python Apache-2.0

Communication - Custom Communication Systems