PocketC Runtime - The runtime version is for those who have no desire to compile applets, but want to run someone else's applet. Using this version saves memory, since the compiler has been removed. This version is freeware and may be distributed freely by developers, but only in its entirety
Z47 Virtual Processor - allows you to run Z++ applications that are created with Z++ Visual. (Z++ Visual is an all-in-one development tool that requires no confusing SDK's, API's, or emulators
The iScript is an open-source implementation of WMLScript engine for PalmOS devices.
It is compiled as standard PalmOS system library and may be used not only in WML browsers, but in any application, which requires scripting capabilities.
Update Description:
version 1.1
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