Is an Open Source Web Application Framework that helps you write kick-ass PHP programs.

CodeIgniter is a powerful PHP framework with a very small footprint, built for PHP coders who need a simple and elegant toolkit to create full-featured web applications. If you’re a developer who lives in the real world of shared hosting accounts and clients with [ad#squere-ads] deadlines, and if you’re tired of ponderously large and thoroughly undocumented frameworks.

You can download it here.