GermsModule which replaces the startup banner with a picture (Sprite, JPEG, Draw) of your choice. Versions prior to v3.00 were developed by Mark Greenwood and part of the BlackHole application.
FatPaintA pixel oriented drawing program by Mark Greenwood.
BlackOutThis is a screensaver frontend with lots of different savers and a random mode. RISC OS 4 and later has its own Screensaver system.