Links
Required/recommended software
sscep: http://www.klake.org/~jt/sscep/OpenCA: http://www.openca.info/legacy/index.html
OpenSSL: http://www.openssl.org/
Other projects
OpenXPKI (under development):
http://www.openxpki.org/
Consultancy
Cynops GmbH:
http://www.cynops.de/