Ntfy is a pretty good open source notification service which you can host yourself
This is a pretty flexible service that will send notifications to your mobile phone. You can either use their cloud service, or host it yourself.
Apart from being able to send notifications directly from any command line, various apps such as Uptime Kuma, Home Assistant, and more also have built in support for Ntfy.
See https://www.xda-developers.com/set-up-self-hosted-notification-service
#technology #selfhosting #opensource #notifications