Quote - If the question is "MUST HAVE?" The answer is: NONE.

But there are some nice ones, that make life easy.
But "MUST HAVE? " NONE.

That being said, there are loads I would'nt delete,

D3D's freebie pack of 10 (from Content Paradise, I think) includes Delete, which allows you to delete a list of figures or props from a scene rather than Poser's default individual select/delete. Copy Morphs gets regular use too.

Check Ockham's free scripts too, many useful scripts for all sorts of specific tasks.

Poser Physics is the reason I keep P7 on my system