Capers was proposed as a whole replacement OS for Palm PDA devices a long time ago. There are a series of pages under this one that have applets from Capers available for download if you want to play about with them. They only work on pre-OS5 Palm OS devices, so don’t try them on anything like a Tungsten, you’ll be disappointed. Also they mainly work with MIDI over serial.
You’ll find all of the actual apps (.prc files) and PDFs about them, below.
In addition to the file downloads, here’s the only documentation I have on these apps. I hope you find it useful.
More Palm related content
If you’re interested in more Palm related posts and pages, here’s some to get you started.