Sunup is described as 'UnifiedPush distributor using Mozilla's push server' and is an app. There are four alternatives to Sunup for a variety of platforms, including Android, Linux, Web-based, F-Droid and Flatpak apps. The best Sunup alternative is ntfy, which is both free and Open Source. Other great apps like Sunup are UnifiedPush, NextPush and Alphorn.
Send notifications to your phone from any Bash or PowerShell script, or from your own app using PUT/POST requests, e.g. via curl on Linux or Invoke-WebRequest.
UnifiedPush is a set of specifications and tools that lets the user choose how push notifications* are delivered. All in a free and open source way.
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