Automatically updates and applies certificate revocation lists
OpenID relying party for Apache httpd
Multiple server/webapp vulnerability scanner
Open Source PKI solutions
An easy-to-use anti-spam email gateway
ICAP Daemon that implements content scanning
Authentication, Access Control, and Single Sign-On
PIN Knock Auth for Web Projects
Free-SA is report generating tool for web, proxy and mail log files
A protocol agnostic application layer denial of service attack.
mod_gnutls apache module