Mozilla Public License is described as 'The Mozilla Public License (MPL) is a free, open source, and detailed software license developed and maintained by the Mozilla Foundation'. There are three alternatives to Mozilla Public License, not only websites but also apps for . The best alternative is Creative Commons, which is free. Other great sites and apps similar to Mozilla Public License are GNU General 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.