ntfy
OPEN SRCPush notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.
Open-source and self-hostable, offering great flexibility and data ownership.
Completely free to use on the public server (ntfy.sh) with no account required.
Extremely simple API makes it easy to integrate with any script or service.
Public server notifications are not private; messages are not end-to-end encrypted.
Lacks some advanced features of paid alternatives, like detailed audit logs or guaranteed delivery SLAs.
System administrators and DevOps engineers
Zabbix, Prometheus Alertmanager, Python applications, Node-RED
HTTP-Based Publishing, Topic-Based Subscriptions, Multi-Platform Apps