The Sinclair QL Forum

Amongst the software we have preserved, comes a little program Leonardo, which is a nice icon controlled screen design program written in SuperBASIC by Rolf Bühler

I see the Wikipedia lists this under:
QL Fantasy (World 2000, Golf Plus, Fireball Plus, Satellites, Marine, Leonardo, Amadeus, Q-Prints), RB Software, 1986

Does anyone know any more about RB Software and maybe the other programs?

Leonardo now available at Graphics section by courtesy of Dilwyn & Rich.
It is possibly not the best painting app available, but I quite like its simple and intuitive design.