The requirements for such programs are necessarily pretty tough because I want them to be impressive and stress the capabilities of BBC BASIC. They should run on every edition (Windows, Linux, Mac OS, Raspberry Pi, Android, iOS) and ideally should evoke the reaction 'wow, I never realised BBC BASIC could do that'!

If anybody has what they consider might be a suitable candidate I would be very interested to hear from them. Alternatively if you fancy attempting to write such a program I would encourage you to do so, and to be as ambitious as possible!
Richard.