Try Standard ML in the Browser, Courtesy of Univeristy of Saarland

https://github.com/SOSML/SOSML

Nice to see a new SML project, even if it happens to be written in typescript.

Requires ; at the end of statements to evaluate. For example

fun gcd (x, y) = if y = 0 then x else gcd (y, x mod y); gcd(56, 24);