The TOP500 project ranks and details the 500 most powerful non-distributed computer systems in the world.
Since November 2017, the great majority of the TOP500 supercomputers use an operating system based on the Linux kernel
The Green500 list ranks computers from the TOP500 list of supercomputers in terms of energy efficiency, typically measured as LINPACK FLOPS per watt.
Réf: TOP500 (https://en.wikipedia.org/wiki/TOP500)
Linux and free-libre communication protocols play an decisive role in all networks