A funny thing happened to open source in 2009. In a year when the viability of open source business models came into question, and the debate over what is or isn't open source software got messier, open source became the dominant software paradigm.
Yes, as Ashlee Vance famously noted in the New York Times last November, few open source pure plays besides Red Hat are making serious money. Even acquisitions of independent open source companies slowed, with many smaller plays simply falling into obscurity. But that doesn't change the fact that open source software is taking the lead in a number of categories, with big guys like Google and IBM using it as a wedge to dislodge commercial software competitors.
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And then there's the game-changing Hadoop, the Apache project based on Google MapReduce that enables developers to create applications that run HPC-class jobs on commodity hardware -- either locally or in the cloud.