H Hyphanet Anonymously share files, browse and publish _freesites_ (web sites accessible only through Hyphanet) and chat on forums. Self-hostedOpen sourceCommunication - Custom Communication Systems 1 228GPL-2.0Javamis à jour le sept. 2026
Conduit A simple, fast, and reliable chat server powered by Matrix. Self-hostedOpen sourceCommunication - Custom Communication Systems 964Apache-2.0Rustmis à jour le oct. 2026
N Notifo Multichannel notification server with support for Email, Mobile Push, Web Push, SMS, messaging and a javascript plugin. Self-hostedOpen sourceCommunication - Custom Communication Systems 883MITC#mis à jour le sept. 2026
OTS One-Time-Secret sharing platform with a symmetric 256bit AES encryption in the browser. Self-hostedOpen sourceCommunication - Custom Communication Systems 807Apache-2.0Gomis à jour le oct. 2026
S 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. Self-hostedOpen sourceCommunication - Custom Communication Systems 421GPL-3.0C++mis à jour le oct. 2026
S Shhh Keep secrets out of emails or chat logs, share them using secure links with passphrase and expiration dates. Self-hostedOpen sourceCommunication - Custom Communication Systems 420MITPythonmis à jour le sept. 2026
P PushBits Notification server for relaying push notifications via Matrix, similar to PushBullet and Gotify. Self-hostedOpen sourceCommunication - Custom Communication Systems 370ISCGomis à jour le janv. 2026
T 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). Self-hostedOpen sourceCommunication - Custom Communication Systems 323MITDockermis à jour le oct. 2026
S SAMA Next-Gen self-hosted chat server and clients. Self-hostedOpen sourceCommunication - Custom Communication Systems 161GPL-3.0Nodejsmis à jour le sept. 2026
Continuwuity Community-driven Matrix homeserver, the continuation of conduwuit focusing on user experience and new features (fork of Conduit). Self-hostedOpen sourceCommunication - Custom Communication Systems Apache-2.0Rust
G GNUnet Software framework for decentralized, peer-to-peer networking. Self-hostedOpen sourceCommunication - Custom Communication Systems GPL-3.0C
G Groupboard Online whiteboard, audio/video conferencing, screen sharing, shared code editing and optional session recording/playback. Self-hostedGratuitCommunication - Custom Communication Systems ProprietaryUnknown
J Jami Universal communication platform which preserves the user's privacy and freedoms. Self-hostedOpen sourceCommunication - Custom Communication Systems GPL-3.0C++
P PrivMX WebMail Web-based, end-to-end encrypted email platform that uses an independent PKI. Self-hostedGratuitCommunication - Custom Communication Systems ProprietaryPHP
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. Self-hostedGratuitCommunication - Video ConferencingCommunication - Custom Communication Systems ProprietaryDocker
V 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 (alternative to Slack). Self-hostedGratuitCommunication - Custom Communication Systems ProprietaryC++