Many.

A decade & a half ago, I put the original project team lead in touch with the London user group, which resulted in this talk:

https://www.rougol.jellybaby.net/meetings/2012/PaulFellows/

A decade later, I moderated a virtual interview with him and the surviving core team members:

https://www.theregister.com/software/2022/06/23/how-risc-os-...

One of the core team got head-hunted to NeXT in the USA. He took his Archimedes running RISC OS with him. Reportedly, he demonstrated it to his colleagues, and presto, the following beta of NeXTstep had this new "Dock" that was much like the Acorn RISC OS "icon bar".