awesome: Beastie/Leon McNeill just open sourced their Ultima III colour Macintosh port, all written in Think C!
This is the "Lairware" version that was sold at lairware.com, and received many updates over the years - eventually gaining OS X/Intel 32-bit support. The source appears to be an Xcode project with a mix of think C and cocoa.
great job, Leon!