These are some programs I wrote many years ago to convert Apple II binary file formats to things that are usable on current systems.
a2pic.c: Convert hi-res images to XPM. Sorry, it seemed like a future-proof format choice at the time.
awp.c: Convert AppleWorks Word Processor files to HTML
fp.c: Convert AppleSoft BASIC source files to text
orca.c: Convert ORCA/EZ assembler source files to text
pack.c: Decompress run-length-encoded compressed images
ps.c: Convert small images from The Print Shop to XPM
and less usefully: