Fabrik - The Application Builder
Fabrik provides you with all the tools that you need to create applications that range in complexity from simple contact forms to complex applications such as a job application site or bug tracking systems.
For programmers, Fabrik still allows customization via PHP, xhtml/css templating and javascript.
Fabrik has a broad set of functions, both basic and advanced, and with these it is possible to create a broad range of applications.