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8. It's hard to find
Open-source software is everywhere. It's available on Download.com, in the Android Market, in every Linux distribution's Add/Remove Software utility, and from websites across the globe. If you can do a Google search, you can find it.
There are dedicated sites for open-source software on specific platforms, and even Microsoft has a dedicated open-source site. Open source has come a long way from its roots, when locating the counterpart to a proprietary piece of software was like finding the proverbial needle in a haystack.