Comment You could try CASLsoft 4.3 (Score 2) 170
It's free from http://windows.novellshareware... . There are also other app-building tools out there.
When I had a Palm, I used several programs from Tealpoint Software. Their web page is dead tonight, but the Google cache copy from yesterday shows dates from 2013. Perhaps your question provoked a huge run on Palm software and their server couldn't handle the load.
https://webcache.googleusercon...
Palm had the best calendar program (DateBk, not to be confused with DateBook) I've ever used on any platform.