I recently acquired a Libretto 50CT, for which I have deeply lusted ever since first seeing one back around '97.
Whoever owned this previously was apparently as much of a handheld nerd as I am/was. Upon digging through the hard drive, I was immediately greeted with CPACK100 staring me in the face. Some more rummaging led me to Intellisync for the LX, plus some other software for syncing a Sharp organizer (not a Wizard; probably some YO- model), and old Windows CE handhelds.
On a side note, it's rather surprising how IE4 isn't actually 100% useless - I'm posting this from the Libretto. This website renders just fine, in fact.