Here is a list of companies that have rather large amounts of open source work, yet still manage to be successful
Why I Open Source
Sean Kilgarriff

Although the companies in this list have open sourced software that many of us use constantly (Bootstrap, from Twitter, for example), these companies do not open source their core product software. For example, although Google has published a huge body of open source software, they don’t publish much when it comes to search or ads.

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