For questions about the Creative Commons licenses and the organization behind them. There are many Creative Commons licenses, so if you are asking a question about a specific license be sure to state which one.
Creative Commons is "a non-profit organization that enables the sharing and use of creativity and knowledge through free legal tools."
The organization is widely known for its set of licenses. Not all are open-source, but many are:
Furthermore, many Creative Commons licenses are not intended for use within software contexts and applications, instead intended for application and implementation within the creative works. For example, works of writing, art, photography, graphic design and the like.
There is a good summary of the licenses' status here.