Open Source: What is the Total Cost of Ownership?

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In 2005, Scott McNeely of Sun Microsystems quipped that open source software was "free like a puppy is free". Just as you can pick out a puppy from the pound without paying expensive breeder fees, you can download and use open source software without buying a single license. But puppies become dogs, and dogs need food, toys, training and lots and lots of love. The same goes for open source software.