Getting CRL from CA

Hello,

Maybe a stupid question, but I cannot figure out the answer.

I have a secured SSL/TLS server with client authentication.
I accept user certificates for various CA of my choice, so
I have those CA certificates available and verified, etc.

But, in order to validate user certificates, I need to
update the various CRL from those CA.

Is there a standard way of knowing where and how to connect
to get those CRL, beside reviewing individually for each
CA its CPS ?

Another question strongly related to this one : is there
any opensource tools to achieve thios goal available to
your knowledge ?

Thank you for your time,

François
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