Zotonic is available under the Apache License 2. It's our way to say thanks to the giants on who's shoulders we stand.
The Apache License, Version 2.0 basically allows to use the source of Zotonic in any way. You may reproduce it, copy it, change it, redistribute it, wash it, rinse it, or make coffee with it. When you are interested, then you can read the full license.
Build upon Open Source
Zotonic is Open Source itself, but it also builds on top of some great Open Source projects. It would not have been possible to make Zotonic without the projects on the right.
Our gratitude and thanks go to the authors and the countless contributors of these projects.