This article is from the Secure Sockets Layer Discussion List FAQ, by Shannon Appel SAppel@consensus.com with numerous contributions by others.
We know of these CAs:
Thawte Consulting <http://www.thawte.com/certs/>
COST Computer Security Technologies <http://www.cost.se/>
Numerous other CAs now exist; additional links will be included in
the replacement TLS/SSL FAQ intended for the future.