The Journal of Online Mathematics and Its Applications, Volume 7 (2007)
Creating Mathlets with Open Source Tools, Markus Hohenwarter and Judith Preinder

Conclusion

In this article we have shown you how to create new and change existing mathlets very easily with GeoGebra. One important idea of open source tools (like GeoGebra) and collaborative software (like wikis and forums) is to share knowledge and ideas freely. Free software does not only take away the burdens of license fees and proprietary systems, above all it promotes cooperation.

"Free software" is a matter of liberty, not price. To understand the concept, you should think of "free" as in "free speech," not as in "free beer." (Free Software Foundation)

When authors of mathlets follow this idea and allow others to change their work (e.g. with a Creative Commons license), both quality and quantity of interactive materials on the Internet can increase. Our free environment - GeoGebra with the GeoGebraWiki and user forum - can be seen as an example for the change from static web pages and libraries with unchangeable content towards a collaborative Internet that is driven by its users - in our case by a community of creative mathematics educators.