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Open source should be a team sport. Since you’re free to download the code and rewrite it to fit your needs, you should also feel free to share your customizations with your closest friends and family. Over the years, Linux, the centerpiece of the open source world, has been spun into hundreds of distributions (or, “distros’ as they’re more commonly called). Think there’s an underserved niche no one else has addressed? Does your own business need a purpose-built OS environment to fit its unique workflow? Then by all means, customize away.