The ABCs of LDAP: How to Install, Run, and Administer LDAP Services

http://www.openssl.org: OpenSSL distribution.

http://www.pseudonym.org/ssl/ssl_intro.html: Introduction to SSL.

http://www.pseudonym.org/ssl/ssl_cook.html: OpenSSL Certificate Cookbook.

http://asg.web.cmu.edu/cyrus: Cyrus SASL distribution.

http://web.mit.edu/kerberos/www: Kerberos distribution from MIT (Version 5 for United States and Canada only).

http://www.crypto-publish.org/mit-kerberos5/index.html: Kerberos distribution including countries outside United States and Canada.

http://www.pdc.kth.se/heimdal: Kerberos distribution including countries outside United States and Canada.

http://www.openldap.org/pub/ksoper/OpenLDAP_TLS_howto.html: How-to for TLS questions.