messaging

Simple HTTP-based pub-sub notification service for sending push notifications to your phone or desktop via PUT/POST

Apprise allows you to send notifications to almost all of the most popular notification services available today such as: Telegram, Discord, Slack, Amazon SNS, Gotify, etc. through a single unified interface.

Tinode is an instant messaging platform with a Go backend and clients for iOS, Android, web, and command line, designed for building chat applications with modern features.

SimpleX Chat is the most private and secure messaging platform with no user identifiers, featuring double ratchet E2E encryption and a unique approach to privacy that doesn't require phone numbers or usernames.

Centrifugo is an open-source scalable real-time messaging server that can instantly deliver messages to application users over WebSocket, HTTP-streaming, SSE, GRPC, and WebTransport. It provides a language-agnostic PUB/SUB server for building real-time applications.

Synapse is the reference homeserver implementation for Matrix, an open standard for secure, decentralized, real-time communication across different service providers.

Dittofeed is an open source customer engagement platform for automating transactional and marketing messages across email, SMS, mobile push, WhatsApp, Slack and other channels.

Live Helper Chat is an open-source live support application that enables real-time customer support through web chat. It features a comprehensive set of tools including chatbots, voice/video calls, mobile apps, and integrations with popular messaging platforms.

Tox is a distributed, secure messenger with audio and video chat capabilities, providing peer-to-peer encrypted communication without central servers.

AnyCable is a realtime server for two-way reliable communication over WebSockets and SSE. It provides a scalable and performant solution for adding realtime features to any backend application.

Databag is a federated messenger for self-hosting that focuses on efficiency and minimal resource usage. It provides decentralized communication with end-to-end encryption, audio/video calls, and topic-based threading.

Spectrum 2 is an open-source instant messaging transport that bridges different IM networks, allowing users to communicate across platforms like XMPP, Discord, Telegram, and more.