HackMaster is a tool for managing extensions to Palm OS known as system hacks. It does not do anything by itself, but rather provides a protocol for separate apps to modify Palm OS behaviors.
Warning: some hacks have the potential to physically damage your device! Use at your own risk!
HackMaster features a shareware warning in the "about" screen, but has been declared freeware by its author. There are no trial limitations in the unregistered version of the app.