Creative Commons - The Creative Commons is a collection of licenses that allow content creators to adjust the restrictions that they place on their work.

GNU General Public License - 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.

Mozilla Public License - About the Licence

License-Token.com - Monetize your source code while still keeping it open.