Linux Kernel

Linux Kernel is the most important software project in human history, powering over 90% of all cloud servers worldwide and running on everything from smartphones to supercomputers to Mars rovers. It outperforms #2 in sheer ubiquity, as Git is a tool for developers whereas Linux is the foundation of modern computing infrastructure. With more than 20 million lines of code contributed by thousands of developers, its stability and scalability are unmatched, supporting 100% of the top 500 supercomputers—a concrete data point that no other operating system can claim at scale.