What Open Source License Should I Choose?
If you are developing a work that you want everybody to have the right to do anything they want to with, including using for a closed source work, then the most appropriate open source licenses are MIT, BSD and Apache. If your work is a writing or artwork rather than software, then one of the Creative Commons licenses may be more appropriate, again affording full rights to create derivative works.
If you are creating a work that you want to always be open source, with no closed source derivative works, then the most appropriate open source licenses are GPL and APL. AGPL provides more coverage if you work tends to reside on server / back-end.
Github put together a great site explaining the various open source licenses in more detail: choosealicense.com.