Hack managers and hacks are not compatible with Palm OS 5.  Check the Launchers & Utilities section for OS 5 compatible programs.

Software marked with a "*" is highly recommended by JurisPDA.

EVPlugBase : Install, manage and uninstall hacks.  A popular alternative to Hackmaster as a means of controlling hacks.
Developer page: TRG Pro Users Group

HackMaster : Install, manage and uninstall hacks.
Developer page: Daggerware 

*X-Master : Install, manage and uninstall hacks.
Developer page: LinkeSOFT 

*PadlockPlus: Password protection for PDAs.  Requires a hack manager.  Not compatible with Palm OS 5.
Developer page: Padlock Plus

*SwitchHack: A simple and fast method to switch between recent applications.  Requires a hack manager.  Not compatible with Palm OS 5.
Developer page:Deskfree Computing