Many answers here.. looks like "Amiga Programs list"-- and that Post its about Influential Amiga Programs in PC..
I think, Video Toaster, Lightwave, Deluxe Paint, Scala, Some Music Tracker GUI... Maybe, the same Amiga OS GUI and Multitasking Process, in MSWidows exist someting called "MUI" as Amiga OS.. I am not sure wich was first, but somethings in software like Word Procesors, Sheets, etc, Menus are like Amiga aplications.. (remeber, Amiga late 80`s haved).. Diskmaster, today you can see the Windows Explorer are very similar..
Anyway many things in today's PCs may have been Influences by AMIGA!
