web based certificate management

[Tomoki Taniguchi]

is there a good web based certificate management system
that users of freeradius recommend?
i need something that will apply the needed xpextensions
and generate the necessary .p12 and .der certificates for a windows xp client.

i am looking into editing the ebox-ca to generate the additional certificates,
but would perfer not to have to go through the trouble if possible.

TIA,
Tomoki