Open source software – software freely shared with the world at large – is an old idea, dating back to the 1980s when Richard Stillman started preaching the gospel calling it free software. Then Linus Torvalds started working on Linux in the early 1990s. Today, Linux runs our lives. The Android operating system that runs so many Google phones is based on Linux. When you open a phone app like Twitter or Facebook and pull down all those tweets and status updates, you’re tapping into massive computer data centers filled with hundreds of Linux machines. Linux is the foundation of the Internet.