Comparator Tools is a PHP implementation of Java's Comparable interface. It allows objects to be sorted and provides other useful functions for comparison.
Yahoo BOSS (Build your Own Search Service) is a search API. This PHP 5.3 package can retrieve the results of Web, news, and image searches, and also cache them.
OutputFilter is a PHP library that can be used to filter the values of scalars, arrays, and data objects recursively. It can be easily integrated in frameworks. A solution for Zend Framework and Smarty template engine is already included.
A tool for securing DNS communications between a client and a DNS resolver.
A polyhedral extraction tool (PET).