EJBCA is an enterprise class PKI Certificate Authority built on JEE technology. It is a robust, high performance, platform independent, flexible, and component based CA to be used standalone or integrated in other JEE applications.
Recsig is a Joomla component intended to collect digital signatures for Popular Legislative Initiatives (PLI). The component comply with all legal requirements so that collected signatures can be considered valid for PLI by the Spanish law.
sanesigner is a high level digital signature api component. it support generating and verifying digital signatures as well as encryption and decryption using public keys, and lots of other features in between.