Pyrotechnic, a full-featured firework simulator for the Archimedes series of computers. This has been available on a few public domain discs and internet sites tucked away out of sight for a few years now. Thought I'd bring it to your attention as part of a number of RiscOS applications and games I wrote in the late '90s when the Acorn market was contracting quite rapidly so I couldn't find a software house that was interested.
Instructions attached and also within the application. I've got this running on RPCemu 3.71 and is provided here as a regular 7-zip file, just unpack the contents into the hostfs folder on the emulator then use as a normal RiscOS application from within there.
Sample screenshots from the various windows used to create a firework.
