in reply to
Why do People like larry or David Cross write free language and distribue
You may find some of Larry's reasons here:
VIDEO: 45 Minute Interview of Larry Wall on BigThink
Perl, the first postmodern computer language
As for the motivations for building on shared knowledge:
History of free and open-source software
"...the adversities born of well-placed thoughts should be considered mercies rather than misfortunes." — Don Quixote
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Re: Why do People like larry or David Cross write free language and distribue
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