It's a pun on a way to explain open source: Free as in freedom, not free as in free beer. http://en.wikipedia.org/wiki/Free_as_in_Freedom:_Richard_Stallman%27s

It's a pun on a way to explain open source: Free as in freedom, not free as in free beer. http://en.wikipedia.org/wiki/Free_as_in_Freedom:_Richard_Stallman%27s_Crusade_for_Free_Software http://en.wikipedia.org/wiki/Free_as_in_Freedom:_Richard_Sta... So Free Beer isn't beer you don't pay for but it's recipe is freely available, i.e. open source.