HanDBase
Extremely powerful PalmPilot database program supporting up to 30 databases, 30 fields each, many field types, extensive sorting, filtering, and searching options.
JFile Pro
The first full featured database program for the PalmPilot. Supports up to 30 databases with 50 fields each, many field types, multiple sorting and filtering options.
List
Database program for the PalmPilot. Supports up to 12 databases, 3 fields per database, simple sorting. Freeware. Source available.
MobileDB
Palm database software from Mobile Generation Software. Supports up to 20 databases with 20 fields each, multiple sorting and filtering options.
MobileDB Lite
Supports MobileDB databases as read-only; you cannot modify the databases and you cannot create new ones. Freeware.
Palm OS Database Comparison Review
Excellent review of the available database software for the PalmPilot.
Skinny Frog Software
Database software including Fishing managers, exercise managers and free database downloads.