There are several solutions that provide secure transactions for Apache servers. This enables Apache servers to be used for e-commerce or other scenarios where sensitive information (like your credit card number) is exchanged.
Mod_ssl and Apache-SSL are open source implementations. They are European based, unencumbered by RSA patents.
Red Hat offers a secure server derived from Apache. Red Hat acquired C2Net, makers of StrongHold, another Secure server derived from Apache.
Covalent sells secure versions of Apache as well as the CovalentSSL module that plugs into existing Apache installations.
Credit card transactions
Apache specific solutions exist for credit card transactions: