Formhandler is a very flexibel form handling tool. Due to it's flexibility, it is hard to integrate a backend GUI. Instead of a GUI, the "formhandler backend" provides a mechanism to build file and typoscript templates from scratch.
This makes it possible to quickly generate the base of a working form, which thereafter can be configured in detail. Or, it will be possible to let a user edit parts of a predefined form without requesting programming knowledge.