A great language, I cut some of my programming teeth with GraFORTH on Apple II in 1982/1983 in high school. I wish I still had some of my old floppy disks. I did some floating-horizon for plotting f(x,y) and some basic animations. A friend and I did some demo programs for a couple of local entrepreneurs (Romel and Ludimar in case you're out there) selling Apple II clones, the MicroEngenho, in Brasília. Our work, displayed at a trade show, made it onto the nightly news.

MicroEngenho: https://www.youtube.com/watch?v=Mu9CsdGHybw

EDIT: YouTube link