We have added a new project to OpenNTF - XPages Framework Template. This template allows you to quickly create new XPage applications by creating the css layout (OneUI) for you and easily allowing you to manage and translate it.
Download the project from here where you will also find full documentation on features and "how". The video below also shows it in action.
This is fully functional but is also a work in progress. Contact steve dot castledine at uk dot ibm dot com if you would like to contribute to this project.