What are some examples of open source software that has turned into closed source software? [on hold]

Posted by Verrier on Programmers See other posts from Programmers or by Verrier
Published on 2013-06-29T01:27:02Z Indexed on 2013/06/29 4:27 UTC
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As the title says... can anyone think of any software that has made the transition from open source to closed source / proprietary?

These could include software owned by the same company who decided to take a once open source offering and turn it into closed source... but I'm really looking for some examples of companies who developed a commercial closed source product off of an existing open source one (obviously with a permissive license).

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