PhaTestDocs is a project mainly written in ..., it's free.
Description generator for functional tests
Tools for generation description of functional tests.
The main idea of the project - documentation should be located next to the code. This also applies to functional tests. You describe your functional tests and this tool to generate documentation for them that can be sent to developers.
Will be based on Yii framework and therefore will be totally dependent on it (the generation is possible only if set framework). Dependencies are minimal, so you can still use the product in alternative configurations.
Yii-dependence will be officially removed.