Platypus

Here’s one for the more tech-savvy user or developer:

Platypus creates a GUI app from a UNIX (Terminal) script. For instance, you may have an Applescript, Ruby, PHP, or Perl script that you occasionally run in Terminal. Platypus helps you put a “wrapper” around it so that it will run in the Dock, let you drag documents to it, and look like a regular app.

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