Looks really interesting! I will definitely play with it tomorrow. I used Forth for a bit in the past, and played with Factor a bit; my impression is that Xs lo

Looks really interesting! I will definitely play with it tomorrow. I used Forth for a bit in the past, and played with Factor a bit; my impression is that Xs looks a bit like the latter, with some parts from J on top (I don't know K, sadly, so I can't say what features Xs borrows from it).