By Andrew Owen

The PISC playground is developed using gopherjs, HTML, Javascript, and PISC.

Also, the source for PISC is currently the best source of documentation as to how it all works, once you've gotten past the PISC in Y minutes. This isn't an ideal or desired sitation, but it is the way it is for now. I'd recommend taking a look at interpreter.go if you want to understand the core of this, and loops.go, locals.go and dicts.go if you want some starting points.

^{Yes, those are all links the same directory. You'll figure it out. :)}