KeySuite: KeySuite lets you carry more of your important Microsoft Outlook Contacts information on your Palm Powered handheld. you can organize the data the same way on your handheld as you do in Outlook. and carry all key details stored on your desktop with your handheld (e.g. all 19 phone numbers, 3 email addresses, 3 street addresses)
Developer page: Chapura

Missing Sync: The Missing Sync for Palm OS provides all the components necessary to share data with a wide
variety of Palm Powered handheld devices and smartphones and a computer running Mac OS X.
Develope page: Mark/Space

Palm Desktop Software for Mac: Synchronize your Palm OS® handheld with an Apple computer.
Developer page: Palm

*Pilot Install: Let's you install applications without having to perform a full HotSync®.
Developer page: envi.con

*PocketMirror: Outlook synchronization software. Allows Palm OS® handheld users owners to synchronize the Address Book, Date Book, To Do List and Memo Pad on their handheld to Microsoft Outlook Contacts, Calendar, Tasks and Notes. There are several versions available and a wizard to help you pick the best one for your needs. 
Developer page: Chapura