Great. Now for homework try your Google-fu to see all the alternatives to the LabVIEW approach. I've used both, and LabVIEW is far inferior to what can be done with a Linux system.
Go ahead and try to name an actual application that "is supported on Windows but has less support, or lower performance, or doesn't work at all, on the other operating systems ", then I'll tell you the better alternative in the Open Source domain. ( I do agree that if you are in the desktop publishing business GIMP may not be a suitable substitute for Photoshop, though for 99% of people who need to do graphics design and editing GIMP indeed serves as a fine replacement.)
I'm waiting for you to provide 'the better alternative' like you said you would.
I've mentioned this before, but when you have entire ecosystems built on Windows/Office it can be exceptionally difficult to migrate to open source. You have to make sure everything works or you will have people who will block the migration.
If you want another program, then SolidWorks.