Sirius-Sign is a signing and verification server with it's focus on high throughput and easy integration into an existinig landscape. For signature creation smartcards with OCF and PKCS11 interfaces are supported. An EJB container is required.
Webswell Connect is a business integration tool based on WS web services, ebXML and AS2 standards. Installer includes ebXML Registry/Repository, universal Message Service Handler and Dispatcher and supporting software. Tech support at www.webswell.com
The Eclipse XML-Security Plug-In allows you to experiment with the W3C recommendations on digital signatures and encryption and to learn all about their background. Arbitrary XML documents can be canonicalized, signed, verified and en- or decrypted.