It would be good if all the following data were available under a free license. Creative Commons Attribution would probably be the most sensible.
* [http://groups.yahoo.com/group/hitching/files/Robert%27s%20programs/ Prino's data and software] Software is available under [http://www.gnu.org/licenses/gpl-3.0.html| GPL V3]
* [http://www.franknature.nl/hitchhike/hitchhike2.htm fverhart]