NaturalMash is a mashup tool aiming at enabling mashup development for end-users. Its novel idea lies in the use of natural language programming combined with What You See Is What You Get (WYSIWYG) and Programming by Demonstration (PbD).
Here are some YouTube videos of a working demo of NaturalMash:
The goal of this front-end is to not only provide an easy-to-use, Web-based user interface to JOpera but also to extend its features by adding user interface design and collaborative service composition capabilities. The latter case is empowered through the use of social networks and online communities. This tool is still under construction.