Flex 4, code named ‘Gumbo’, is now under development and due to be released in early 2010. Flex 4 is being developed with three main themes: Design in Mind, Developer Productivity and Framework Evolution.

PHPUnit is a unit testing framework written in and for PHP. It is extremely easy to run and re-run all your tests the moment you or a co-worker have finished implementing a new feature, and this can be done in the background while you work on another feature or project.

Drupal is a free and open-source content management system (CMS) written in PHP. It is used as a back-end system for many different types of websites, ranging from personal blogs to large corporate and political hubs.

Google Web Toolkit, or GWT, is a Javascript and AJAX framework. GWT web applications are written in the Java programming language.