HackMaster API - How to Write a Hack and describes the Hack file format. - http://www.daggerware.com/hackapi.htm
Palm OS Developer Documentation - Official file format specs for Palm Database (PDB), Palm Resource (PRC), and Palm Web Clipping Application (PQA) files, as well as full SDK, Conduit, and web clipping documentation. - http://www.palmos.com/dev/tech/docs/
PDB Format Man Page - Describes the structure of the PalmPilot .pdb (Pilot Database) file format. - http://www.nicholson.com/rhn/pilot/pdb.txt
DOC Format Man Page - Describes the structure of the PalmPilot .doc standard text file format. - http://www.nicholson.com/rhn/pilot/doc.txt
PRC Format - An attempt to decipher and describe the PalmPilot .prc file format. - http://web.mit.edu/tytso/www/pilot/prc-format.html