Sites I like

Drush.org

http://www.drush.org/

A command line shell and scripting interface for Drupal

Codeigniter

http://codeigniter.com/

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.

Acquia

http://www.acquia.com/

Acquia is a enterprise guide to Drupal. Acquia gives you answers, tools, and support to make Drupal even better. Check out the downloads section for a fast way to create an AMP stack.

charlesproxy

www.charlesproxy.com

Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic.

XAMPP

http://www.apachefriends.org/en/xampp.html

XAMPP is an install for Apache distribution containing MySQL, PHP and Perl. XAMPP

Zend Frame work link

http://framework.zend.com/

Php framework that is used to standardize best practises in Php

Coda

www.panic.com/coda/

Coda is used to cross over text editor, terminal, subversion, its very cool.

Drupal link

http://drupal.org/

The mighty Drupal a CMS and a modular system with a set of API's which adds an abstraction layer between your PHP code and the underlying database.