Today i released h3calc.
It's a sort of BASIC interpreter, without jumps, and designed to be used as a calculator.
It's an old project I did it for an exam about finite state machines and parsers (it uses Byson's LALR parser).
I'm releasing it with a BSD licence, so it's free for any use.
(I think it's very small and handy, I currently use it as a scientific calculator)