LibHTP
A security-aware parser for
the HTTP protocol (2010-)
Thinking Stone 2
Web application security products and services (2004-2006)
ModSecurity Handbook
The definitive guide to
ModSecurity (2010-)
ModSecurity
Open source web intrusion detection and prevention engine (2002-2009)
Feisty Duck
Book publishing with automated single-source production (2009-)
PHP Traveller 1
PHP blog, code, libraries and articles (2002-2005)
SSL Labs 3
A site dedicated to the research of SSL and TLS (2009-)
Njam Njam 1
Cookery web site (2001-2002)
 
Qlue 3
Open source web application framework for Java (2009-)
DGC 1
Web-based intranet, extranet, and document management application (1999)
Apache Security
The complete guide to securing your Apache web server (2005)
  
blog.ivanristic.com

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(1) No longer available
(2) Acquired by Breach Security in 2006
(3) Acquired by Qualys in 2010