communication

Novu is an open-source notification infrastructure that provides a unified API for sending notifications across multiple channels including Email, SMS, Push, and Chat. It offers an embeddable notification center, workflow engine, and no-code email editor.

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle. It provides team messaging, file sharing, project management and integrations in a self-hosted environment.

Open-source customer engagement platform with live chat, email support, and omni-channel desk capabilities

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.

Element is a secure and decentralized communication client for the Matrix network. It provides end-to-end encrypted messaging, voice/video calls, file sharing, and collaboration features with a focus on privacy and security.

Gotify is a simple server for sending and receiving messages in real-time via WebSocket. It provides a sleek web UI, REST API, and supports plugins for extending functionality. Perfect for self-hosted push notifications.

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.

Mumble is an open-source, low-latency and high-quality voice chat program built on Qt and Opus. It provides secure, encrypted communication through a client-server architecture with excellent audio quality and minimal delay.

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.

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.

Chitchatter is a free, peer-to-peer, end-to-end encrypted communication tool designed for private and secure messaging. It offers serverless, decentralized, and ephemeral chat with features like video calls, screen sharing, and file transfers.

GlobaLeaks is a free and open-source whistleblowing software enabling anyone to easily set up and maintain a secure reporting platform. It provides end-to-end encryption, anonymity features, and comprehensive security measures.