You might want to take a look at the piumarta branch of https://github.com/attila-lendvai/maru/tree/piumarta

This is Attila's attempt at more formally evolving maru through several iterations, and includes gezeira etc.

Personally I find able forth's meta compilation to be more manageable (https://github.com/ablevm/able-forth/tree/current)

But your mileage may vary :)

Disappointingly, the able gui etc was not open sourced, and I fear lost to time.