Great to have this covered, I always liked Odin's covers and the art department in general.
I'm trying to also figure out the roles:
Nodes of Yesod
Steve Wetherill - code
Colin Grunes - ingame graphics
Stuart James Fotheringham - ingame graphics
Paul Salmon - ingame graphics
Fred Gray - music
Arc of Yesod
Steve Wetherill - code
Colin Grunes - ingame graphics
Stuart James Fotheringham - ingame graphics
Paul Salmon - ingame graphics
Fred Gray - music
Robin of the Wood
Steve Wetherill - code
Paul Salmon - ingame graphics
Andy Walker - music
Heartland
Steve Wetherill - code
Colin Grunes - ingame graphics - loading screen - level design
Stuart James Fotheringham - ingame graphics (uncredited)
Keith Tinman - music
Pretty sure Colin Grunes did also the loading screen for Nodes and Arc of Yesod, but I don't have a confirmation roaming Steve's blog.