Collapse OS is written by Virgil Dupras.

Other people have contributed bits and pieces to it:

Jakob Kirsch: PC/AT MBR fixes.
Stefan Paul Noack: Z80 SDC driver fixes.
Daniel Marks:
  - Z80 SIO driver fixes and improvements.
  - Dan SBC design and drivers. See doc/hw/z80/dan.txt
Guillaume Salagnac: typo fixes in docs.
binarycat from flounder.online:
  - Bugfixes in ED and VE.
  - Bugfixes/features in PC/AT.
Tormod Volden:
  - Bugfixes in CoCo2.
  - Add Dragon 32 keyboard layout.