A Python-based notification library and CLI that routes messages to 120+ services via URL-based configurations, enabling self-hosted cross-platform alerts.

17.2k stars648 forksBSD-2-Clauselast commit Actively maintained
Managed cloud version of ntfy, a publish/subscribe notification service that delivers push notifications to phones and desktops via HTTP and MQTT topics. Provides hosted infrastructure for publishing messages to topics and subscribing with clients and browsers.
A Python-based notification library and CLI that routes messages to 120+ services via URL-based configurations, enabling self-hosted cross-platform alerts.

17.2k stars648 forksBSD-2-Clauselast commit Actively maintained
Self-hosted relay server exposing a Gotify-compatible HTTP API to send push notifications which are delivered to users via the Matrix protocol; supports multiple users, channels and Docker deployment.
365 stars19 forksISClast commit Slowing down
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 1 of 2 shipped a commit in the last six months. Licences in this list: BSD-2-Clause, ISC. In exchange you take on hosting, backups and updates yourself.
Browse everything in Messaging & Event Streaming (Brokers/Queues).