What an odd list.
Sodium borohydride is really useful in refining! Great for converting AgCl to Ag metal virtually instantly. Same with the PGMs. It's basically the best reducing agent gram for gram that isn't gaseous hydrogen or nasty carbon monoxide. A lot of people use it to waste water treat because it gets every heavy metal that isn't zinc.
The piperonal is also known as heliotrope, after a flower which smells very similar to it.
http://perfumeshrine.blogspot.com/2012/06/perfumery-material-heliotrope.html
It is often used in fragrances because it has a very pleasing odor but it can be misused as a drug precursor. My advice on that one is take it and mix it with vanillin and then add to soy wax and make candles for the house. Alternatively, I used to be involved with a company in Las Angeles making designer fragrances with a huge floral bent--they would probably take this off of your hands for you and pay you for it.
The antimony trisulfate is probably Sb2S3 (antimony trisulfide). That is most certainly used in fireworks.