Open source is 20: How it changed programming and business forever

Every company in the world now uses open-source software. Microsoft, once its greatest enemy, is now an enthusiastic open supporter. Even Windows is now built using open-source techniques. And if you ever searched on Google, bought a book from Amazon, watched a movie on Netflix, or looked at your friend’s vacation pictures on Facebook, you’re an open-source user. Not bad for a technology approach that turns 20 on February 3.