Communication - Custom Communication Systems
46 applications, ranked by GitHub stars in the dataset.
No applications match those filters.
Rocket.Chat
Communications platform that puts data protection first.
Replaces Discord Google Chat Microsoft Teams, and 1 more
46,364 stars Active
2 Nov 2026
Novu
Notification infrastructure for developers.
40,252 stars Active
2 Nov 2026
Mattermost
Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab.
Replaces Discord Google Chat Microsoft Teams, and 2 more
39,510 stars Active
2 Nov 2026
38,761 stars Active
2 Nov 2026
ntfy
Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.
Replaces Pushover
35,252 stars Active
3 Nov 2026
26,160 stars Active
2 Nov 2026
SimpleX Chat
Most private and secure chat and applications platform - now with double ratchet E2E encryption.
19,639 stars Active
21 Oct 2026
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.
17,695 stars Active
1 Nov 2026
OpenWA
WhatsApp API gateway exposing messaging as REST endpoints, with a web dashboard, multi-account sessions, and webhook events.
16,469 stars Active
1 Nov 2026
16,169 stars Active
25 Oct 2026
Element
Fully-featured Matrix client for Web, iOS & Android.
Replaces Discord FaceTime Google Chat, and 10 more
13,636 stars Active
2 Nov 2026
Tinode
Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots.
13,548 stars Active
27 Sep 2026
Centrifugo
Language-agnostic real-time messaging (Websocket or SockJS) server.
10,943 stars Active
2 Nov 2026
Fluxer
Instant messaging and VoIP platform built for friends, groups, and communities.
10,755 stars Active
3 Nov 2026
Screego
Simple tool to quickly share your screen to one or multiple people via web browser.
10,746 stars Active
25 Oct 2026
Typebot
Conversational app builder.
10,601 stars Active
26 Oct 2026
8,391 stars Active
30 Oct 2026
WorkAdventure
Virtual office / virtual conference application presented as a 16-bit RPG video game.
5,906 stars Active
2 Nov 2026
Synapse
Server for Matrix, an open standard for decentralized persistent communication.
4,755 stars Active
2 Nov 2026
One Time Secret
Share sensitive information securely with self-destructing links that are only viewable once.
2,979 stars Active
1 Nov 2026
Tuwunel
High-performance and feature-rich chat server for Matrix, and the successor to conduwuit (fork of Conduit).
2,723 stars Active
2 Nov 2026
Tox
Distributed, secure messenger with audio and video chat capabilities.
2,696 stars Active
2 Nov 2026
Stoat
User-first chat platform built with modern web technologies.
2,684 stars Active
7 Oct 2026
WBO
Web Whiteboard to collaborate in real-time on schemas, drawings, and notes.
2,678 stars Active
2 Nov 2026
AnyCable
Realtime server for reliable two-way communication over WebSockets, Server-sent events, etc.
2,389 stars Active
2 Nov 2026
Chitchatter
Peer-to-peer chat app that is serverless, decentralized, and ephemeral.
2,344 stars Active
2 Nov 2026
Live Helper Chat
Live Support chat for your website.
2,251 stars Active
31 Oct 2026
RetroShare
Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.
2,025 stars Active
1 Nov 2026
GlobaLeaks
Whistleblowing software enabling anyone to easily set up and maintain a secure reporting platform.
1,526 stars Active
2 Nov 2026
Databag
Federated, end-to-end encrypted messaging service for the web, iOS, and Android, supporting text, photos, video, and WebRTC video and audio calls.
1,510 stars Active
14 Jun 2026
Hyphanet
Anonymously share files, browse and publish freesites (web sites accessible only through Hyphanet) and chat on forums.
1,228 stars Active
19 Sep 2026
Conduit
Simple, fast, and reliable chat server powered by Matrix.
964 stars Active
18 Oct 2026
Notifo
Multichannel notification server with support for Email, Mobile Push, Web Push, SMS, messaging and a javascript plugin.
883 stars Active
20 Sep 2026
OTS
One-Time-Secret sharing platform with a symmetric 256bit AES encryption in the browser.
810 stars Active
2 Nov 2026
Spectrum 2
Instant messaging transport. It allows users to chat together even when they are using different IM networks.
421 stars Active
24 Oct 2026
Shhh
Keep secrets out of emails or chat logs, share them using secure links with passphrase and expiration dates.
420 stars Active
17 Sep 2026
PushBits
Notification server for relaying push notifications via Matrix, similar to PushBullet and Gotify.
Replaces Pushover
371 stars Active
10 Jan 2026
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.
326 stars Active
28 Oct 2026
SAMA
Next-Gen self-hosted chat server and clients.
161 stars Active
10 Sep 2026
Continuwuity
Community-driven Matrix homeserver, the continuation of conduwuit focusing on user experience and new features (fork of Conduit).
No repository figures recorded
GNUnet
Software framework for decentralized, peer-to-peer networking.
No repository figures recorded
Groupboard
Online whiteboard, audio/video conferencing, screen sharing, shared code editing and optional session recording/playback.
No repository figures recorded
Jami
Universal communication platform which preserves the user's privacy and freedoms.
No repository figures recorded
PrivMX WebMail
Web-based, end-to-end encrypted email platform that uses an independent PKI.
No repository figures recorded
TrueConf
Platform for your corporate communications, based on the advanced architecture, with support for UltraHD video conferencing, built-in messenger with personal and group chats, and a free version for up to 1,000 users.
No repository figures recorded
Virola Messenger
Instant messaging and collaboration tool with private and group chat rooms, continuous voice and video meetings, files sharing, issue tracking with integrated task board.
No repository figures recorded
