Apache and Secure Transactions
   It explains what SSL is, why Apache does not have it built in, and why it is such a complex issue. (Apache Week)
   http://www.apacheweek.com/features/ssl

Apache+SSL Win32 HOWTO
   Setting up Apache with mod_ssl on Windows NT and 98 to provide secure HTTP services.
   http://tud.at/programm/apache-ssl-win32-howto.php3

Apache-SSL
   An implementation of Apache with SSL capabilities. It is based on SSLeay/OpenSSL. It is not subject to US export control. [Free / Open Source]
   http://www.apache-ssl.org/

Covalent Technologies, Inc.
   Offers Raven SSL, which adds SSL support to Apache web server. Not exportable from North America.
   http://www.covalent.net/

SSLWrap
   An inetd service (for Unix operating systems) that sits over POP3, IMAP, and SMTP, and encrypts data using SSL.
   http://www.quiltaholic.com/rickk/sslwrap/

Stunnel
   A universal SSL tunnel. It is designed to work as SSL encryption wrapper between remote client and local (inetd-startable) or remote server. [Free / Open Source]
   http://stunnel.mirt.net

Stunnel FAQ - Frequently Asked Questions
   Where to get the software, how to install and run it, and troubleshooting tips.
   http://www.onsight.com/faq/stunnel/

mod_ssl: The Apache Interface to OpenSSL
   The module provides strong cryptography for the Apache 1.3 webserver via SSL and TLS protocols, it was developed using OpenSSL, which is based on SSLeay. [Free / Open Source] (Ralf Engelschall, Ben Laurie)
   http://www.modssl.org/