This probably isn't quite what OP had in mind, but I put together a number of Python and Bash scripts to control my home media center. Then I used the iOS Alfre

This probably isn't quite what OP had in mind, but I put together a number of Python and Bash scripts to control my home media center. Then I used the iOS Alfred app to give them a front end on my phone as a remote. I also made them actionable with various flags so I could call them by typing them into the Mac Alfred app. Power on / off home theater device and set inputs Power projector on / off and set inputs Make calls to both at the same time working together Call AppleScripts to control music playing through the stereo from a connected Mac mini I also built a tool for a friend in Bash and AppleScript. It watches a list of his favorite streamers and then calls to the Downie video download app to begin recording their streams. He runs it on a headless Mac mini checking each person in the list every two minutes. Of all the things I've made for myself or others, these are the two that would most resemble a user-facing GUIable end-product. edit: a letter