PRCExplorer - Using this tool you can open any PRC file and navigate into it. You can see individual resources, graphically display Forms and Alerts, Bitmaps, Fonts, ... This is useful to debug and develop your application as well as analyzing PRCs
Pilot-DB - freeware (OpenSource) database program for the Palm OS (any version and any hardware) and compares with the best commercial programs available.
It supports the field types string, boolean, integer, float, calculated, date, time, note, list and link
pdbc (PDB Compiler) - a compiler than converts a source file into a Palm DataBase file (PDB file).
The language the pdbc compiler understands is designed to be easy to understand und write.
Yet it is powerful enough to give the freedom to describe the binary content of the database records in a variety of ways