The Cathedral and the Bazaar
Interesting essay about open source.
Bazaar is the open source model, code is open for everyone, every time. Like github projects.
Cathedral, source is given from release to release.
Summary:
http://en.wikipedia.org/wiki/The_Cathedral_and_the_Bazaar
Full essay:
http://www.catb.org/~esr/writings/cathedral-bazaar/cathedral-bazaar/