(R)PN (P)HP 1
Free online scientific calculator.
I wrote this to go along with my Net Basic as a set of tools I like to think of as "website widgets."
It's a calculator that accepts BASIC like expressions. There's an input box for the expression along with 26 more input boxes for variables named a-z. All of the expression and variable data remains persistent on the page with every query.
https://lucidapogee.com/rp1/