We all rely daily on free and open source software, whether we know it or not. The entire Internet is held together by open source software. The cheap router that powers you Wifi network at home uses the Linux kernel. Your android phone is based on the Linux kernel. Google servers run Linux. Almost everyone is a Linux user. For most people, the financial value of this software is an abstract concept. I think that most people assume that open source software must be cheap. On the contrary, produc...