A correction: "Open source" software is eating the world! You can always see an open source counterpart of an app, which is on par or better than the competitor. Meet Sambapos, an open source POS solution that runs on Windows, supporting touch screens, tablets and thermal printers. It actively runs in restaurants & bars in more than 50 countries.
The good part of open source is collaboration: Sambapos is translated to 18 languages, and sees 1000+ downloads each month.