Debian

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  https://www.debian.org/intro/why_debian

Debian is a Unix-like computer operating system that is composed entirely of free software

The Debian Project was first announced in 1993 by Ian Murdock, Debian 0.01 was released on September 15 1993, and the first stable release was made in 1996.

The Debian stable release branch is one of the most popular for personal computers and network servers, and has been used as a base for several other distributions.

Debian is reliable. Debian proves its reliability every day in thousands of real world scenarios, ranging from single user laptops to super-colliders, stock exchanges and the automotive industry. It is also popular in the academic world, in science and in the public sector.

Debian is free and open source – there are no limitations and you can inspect, integrate, extend and modify however you want.