SQL Injection Cheat Sheet : Samples are provided to allow reader to get basic idea of a potential SQL Injection attack and almost every section includes a brief information about...
Software Folklore : Sometimes bugs have symptoms beyond belief. This is a collection of such stories from around the web.
Debian New Maintainers' Guide : This document tries to describe the building of a Debian package to ordinary Debian users and prospective developers.
JSON Schema : JSON Schema is a vocabulary that allows you to annotate and validate JSON documents.
This is a collection of known design patterns and some sample code how to implement them in PHP. Every pattern has a small list of examples (most of them from Zend Framework, Symfony2 or Doctrine2 as I'm most familiar with this software).