It could easily be argued that PyPy incorporates much of the sort of innovation which many people have said never happens with free software.
Seems to me this is just the kind of innovation that has always happened in free software: Experimental languages and language implementations have usually been distributed with as some kind of free software, long before the GNU project and Linux. With languages, the programmers are their own users, and are in the best good position to implement and test their ideas. The problems with innovation occur when this is not the case, such as with office software, where the end-user and the implementor are people with very different skills and points of view.
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