Agendus Mail is a POP/IMAP email and SMS client with support for updating mail over HotSync or live via the web. It supports a variety of folder options to keep your messages organized as well as the ability to export messages to memos.
Chatopus is a Jabber/XMPP client for instant messaging on Palm OS with support for a wide variety of chat services including Google Talk, Facebook, Twitter, MSN, Yahoo!, ICQ, QQ, and more.
CJKOS adds support for Chinese, Japanese and Korean text input/display on Palm OS 4 and 5. As CJK support files can be rather large, CJKOS is divided up into databases so that only the necessary languages and characters are installed.
Get directions anywhere in the world on the go with Google Maps on your web-enabled Palm OS device! (Yes, it still works!) Requires an active internet connection via Bluetooth, WiFi, or cellular data.