The OpenCA OCSP Responder is an RFC 2560 compliant
OCSPD responder. It can be used to verify the
status of a certificate using OCSP clients (such
as Mozilla/Netscape7). The Responder is actually
included in the main OpenCA distribution package.
It is also possible to install the daemon as a
stand-alone application, in which case you will
need a CRL (or access to an LDAP server where the
CRL can be obtained).