CakePHP is a PHP web application framework that is modeled after Ruby on Rails. It makes building web applications simpler, faster and require less code. It features easy configuration, rapid prototyping with code generation and scaffolding, clean MVC conventions, and security measures against common web attack techniques.

Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design. Python's equivalent to the famous Ruby on rails, Django lets you build high-performing, elegant Web applications quickly. Django focuses on automating as much as possible and adhering to the "Don't Repeat Yourself" (DRY) principle.

Tomcat is a servlet container that implements the Java Servlet and the JavaServer Pages (JSP) specifications, and provides a "pure Java" HTTP web server environment for Java code to run in. Tomcat powers numerous large-scale, mission-critical web applications across a diverse range of industries and organizations.

SilverStripe is an award-winning open source web content management system and application framework used by governments, businesses, and non-profit organisations around the world. It is a power tool for professional web development teams, and web content authors rave about how easy it is to use.