Among all the built-in apps in the HP palmtop, the one I find using the most is the database application. Although it is quite powerful and easy to use, it is lacking calculation capabilities, which could make it even more useful.
For example, a delivery-man has created a database to keep track of his car mileage. Wouldn't be nice if he could find out the total mileage (or average) of all the entries of his database without the hassle of exporting all the data to an external application such as 123? DBCalc was designed for such purpose. It can perform simple calculations DIRECTLY on your database files, and display the results. It lets you select which database and what operation should be done in a similar manner the HP Solver application does.
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This file can be found in the PDA Software Library. Keyword PDA.