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So… my only requirement for my tools is that they have a well-supported CLI, and can be installed headless without graphical dependencies. Tools must be scriptable.
That said, it’s nice to have a UI. My ideal configuration is a scriptable tool with a good API, and a separate GUI tool that can drive it.
One of the best tools I’ve used is SuperSlicer. It’s a slicer for 3D printers. It has GUI, it has CLI and it has a DLL/SO so you can add its features to your own application. And it’s open source if linking against an existing library is too hard for you, lol.