- PHP Manual
PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML.
- MySQL 5.1 Reference Manual
The MySQL software delivers a very fast, multi-threaded, multi-user, and robust SQL (Structured Query Language) database server.
- Apache HTTP Server Version 2.2 Documentation
The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems including UNIX and Windows NT.
- Linux HOWTOs
Linux HOWTOs are documents which describe in detail a certain aspect of configuring or using Linux. HOWTOs are comprehensive docs - much like an FAQ but generally not in question-and-answer format.