Zeon.js is a tool that helps you find problems in your JavaScript / ECMAScript. It uses a custom parser and static analysis to bring your attention to possible problems.
PHP Object Generator, (POG) is an open source PHP code generator which automatically generates clean & tested Object Oriented code for your PHP4/PHP5 application.
As a php web developer, you should know that php is probably the language that has the biggest code repository. So no matter what module you want to include in your project there should be an open source solution.
Open Source Software Engineering Tools