Suhosin is an advanced protection system for PHP installations. It provides security updates to the core installation and included appliations. Suhosin is binary compatible to normal PHP installations, allowing it to also work other 3rd party extensions.   Code: PHP 4.0

Mirfak is an open source mod_frontpage reimplementation that is more secure, and can be used with a binary installation of Apache. Binary installation can potentially include mod_ssl, PHP, and more. The module is licensed under the Apache license.   Code: PHP 4.0