Creative Commons is described as 'licenses provide a flexible range of protections and freedoms for authors, artists, and educators'. There are three alternatives to Creative Commons, not only websites but also apps for . The best alternative is GNU General Public License, which is free. Other great sites and apps similar to Creative Commons are Mozilla Public License (Free) and WTFPL (Free).
The GNU General Public License (GNU GPL or GPL) is the most widely used free software license, which guarantees end users (individuals, organizations, companies) the freedoms to use, study, share (copy), and modify the software.