Beautiful Calculator Input / Filter Plugins

Hello,

do you have any idea for beautiful calculator / filter input plugins which can be displayed on top of my homepage and within my sidebar? Users should be able to type in amounts, make decisions from boxes, choose countries (With auto complete and a flag would be so great) and maybe even more decisions?

It’s only about beautiful input: How can I create it with existing tools? The rest is already working and will be brought together.

I’m already searching quite a while, have made searches at WordPress and Codecanyion but I assume NinjaForms etc. is not really what I am searching for?

Thanks so much.