Programs for Acorn computers usually had an "Info" box that showed the name, purpose, author and version of the program. RISC OS 3 itself had one of these boxes:
I have no idea how I found this out, but if you clicked the middle mouse button on the letters 't', 'e', 'a' and 'm' in "Acorn Computers", the box would cycle through a list of the people who were involved in making RISC OS. It took just under 2 minutes to go through the whole list.
Here's the full list of names:
© Acorn Computers Ltd, 1988 © Acorn Computers Ltd, 1989 © Acorn Computers Ltd, 1990 © Acorn Computers Ltd, 1991 © Acorn Computers Ltd, 1992 Thanks are due to: Bruce Cockburn Chris Partington Jonathan Coxhead Philip Colmer Steve Cormie Andrew Cummins David De Vorchik Tim Dobson Adrian Godwin Steve Hunt Ian Johnson Lawrence Rust Ran Mokady Chris Murray Edward Nevill Neil Raine Jonathan Roach Jamie Smith William Stoye Roger Wilson Thanks to: Tudor Brown James Bye Martin Clemoes Colin Dean Teresa Downey David Elworthy Paul Fellows David Flynn Steve Furber Jonathan Griffiths Rachel Haigh Dave Howard Ian Jack Richard Manby Aideen McConville Harry Meekings Mike Muller Harry Oldham Andrew Powis Nick Reeves David Roberts Arthur Ross David Seal Lee Smith Owen Smith Gavin Stark Tony Sumner Stuart Swales Paul Swindell Jon Thackray Alasdair Thomas Tony Thompson Hugo Tyson Jamie Urquhart Charles Whyte Jes Wills Others: Aleph One Graham Anderson Alex Bienek John Biggs David Burling Dave Caughley Tim Caspell Tony Cheal Digital Services Neil Gardner Vic Gibling Martyn Gilbert Mark Hall Mike Hill Henry Howarth Richard King Kechil Kirkham Paul LeBeau Rob McKay Brian Rice JacquĆ© Sanalitro Sharon Shelley Graham Smith Ashley Stevens Jim Sutton Peter Watkinson Colin Watters John Wilkins Last and least: David Bell Brian Long Harvey Coleman David Rees Malcolm Bird David Lowdell