Open source changed computing and all that it touches (which is to say just about everything). It redefined the economics of IT and gave control over their software back to users. But the effects went far beyond the source code. Ultimately, open source made possible a style of community-led development that hadn’t really been possible previously. It effectively turned what had been a top-down vendor-led approach to designing and delivering product into one that springs from ideas coming from everywhere. Open source development can look messy compared to integrated proprietary products, but time and time again, the choice, flexibility, and innovation