If you want to run any of these, you'll first need to install the PocketC runtime. PocketC, by the way, is an exceptional little C compiler. Unlike cross-compilers that run on your Windoze or Linux PC, PocketC compiles Pilot memos containing your source code. You can download the full development version (as opposed to runtime) at www.orbworks.com. I highly recommend it.
Here are some fun little applets I wrote...
This applet does flash card drills. Question, answer, question, answer... To use it, download the FlashCard applet. You'll also need a set of cards. Here's a set of German/English language flash cards.
If you want to create your own flash cards, just create a Palm Pilot memo using the following format:
I created DoodleTune for my two year old son. After watching daddy fiddle with his Palm Pilot all the time, he decided I should let him try too. But handing it over seemed a little dangerous; he could delete meetings, to-do lists, or worse with just a few flicks of the stylus... So I wrote DoodleTune.
DoodleTune looks like a simple draw program except that each pixel you draw makes a sound. By dragging the stylus around the screen, you can make some fun little tunes. The pixel's x and y coordinates determine the pitch and frequency of the note. Believe it or not, this proves to be irrestible to a two year old. :)
You can download it here.