Plan My Day
- A planning tool which imports entries from the calendar and todo applications.
- http://plan-my-day.sourceforge.net/

DateBk5
- Replaces the built-in Todo and Datebook applications on the Palm Organizer with an integrated program that maintains the general look and feel of the original applications.
- http://www.pimlicosoftware.com/

Action Names
- Enhances the built-in calendar and to do list with a series of advanced views designed to make managing your schedule easier.
- http://www.iambic.com/pilot/actionnames/