I did an idle webcrawl through some old #riscos archives, and found a neat app that works on RO5 on the Pi! (anymode may be needed)
It's a little math program for algebra/geometry/calculus.
I remember a program like this (for cga pc) being used in my high school geometry class.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko