Too Long; Didn't Read
Besides big achievements such as Linux, the <a href="https://hackernoon.com/tagged/open-source" target="_blank"><strong>Open Source</strong></a> ecosystem is full of reusable projects that deal with a diverse range of technical concerns like frameworks, libraries, servers, databases, etc. As Uncle Bob puts it on the <a href="https://8thlight.com/blog/uncle-bob/2012/08/13/the-clean-architecture.html" target="_blank">"Clean Architecture"</a>, they are just "details". They represent problems that developers don't need to think about if a decent solution built by somebody else is already available.