This set of tools is provided under the Creative Commons license (CC BY-NC 4.0).
A Creative Commons license (CC) is a standardized method of providing permission to share and use a creative body of work, on certain conditions; this licensing structure enables creative work to easily be a part of the public domain.
Share — copy and redistribute the material in any medium or format
Adapt — remix, transform, and build upon the material
The licensor cannot revoke these freedoms as long as you follow the license terms.
Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
NonCommercial — You may not use the material for commercial purposes.