Cryptopad is being developed by J. and M. Labelle since 2000. It is a very popular freeware application with over 40000 downloads of the latest versions only at PalmGear.com.
There are versions supporting Palm OS (R) 2.0, 3.0, 3.5 and 4.x (see "Links""). For version 3 also a simple desktop companion was developed that allows reading of encrypted memos.
With the intention to further improve Cryptopad and also share development efforts :-) M. Labelle decided to donate the source code as a starting point for an Open Source Cryptopad application.