Moved to Off Topic
A few places to look:
http://www.scottandmichelle.net/scott/cestuff.html
http://www.hfrmobile.com/download.htm
http://www.nsknet.or.jp/~skimoto/
http://web.archive.org/web/20040211074329/http://www.lt.sakura.ne.jp/~untan/game/ce.cgi (in Japanese, but just follow the links and you'll find where to download
)
http://web.archive.org/web/20030208010859/http://www.solyanik.com/valeriy/
A lot of programs compatible with H/PC Pro and earlier will also work, though in some cases you may have to drag the window around to see parts of it.
I also suggest that you search the forums here using the keywords "Palm-size PC software" - you'll find lots of other threads about the same topic.