Spectre GCR, by Dave and Sandy Small, is the final version of a Mac emulator for Atari ST previously known as Magic Sac and Spectre 128. I link to its manual because the document is, as the title page says, "FUN TO READ", and

>WARNING: This manual is easy to read an actually entertaining. This may ruin your enjoyment of other computer manuals.

It also has drawings from the Smalls' small children.