🚀 go-pugleaf

There is a really nicely done and inexpensive implementation of Setl
called ISETL (for Interactive Setl) distributed by Gary Levin, of
Clarkson university - gary@clutx.clarkson.edu.

I like to use ISETL as the first ``new'' language that my students see in my 
undergraduate programming languages course, because the syntax is close
enough to pascal that they aren't put off by it (read that as ``no messy
parenthesis'') yet you can do fun things like using functions as first
class values.