I suppose retroPDA postings are okay? 
You need a ROM image to run the emulator (link provided in the post). From Hacker News [ Cloudpilot, a PalmOS Emulator for the Web | Hacker News ]
Cloudpilot can be run as a web page or as a mobile app on phones and tables. The list of features includes
- Realistic emulation of timers and device speed
- Continuous state saves — emulation resumes if the page or app is reloaded
- Direct installation and export of .prc and .pdb files
- Export and import snapshot files
- Switching between multiple emulation sessions
- Audio emulation
- Keyboard input
- Clipboard integration
- Network support (including network hotsync) using a websocket proxy (documentation)
You can download supported ROMs on PalmDB.