FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms.

the main openssh page

news and feature lists of linux and bsd distributions.

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Red Hat is the world’s leading provider of open source solutions, using a community-powered approach to provide reliable and high-performing cloud, virtualization, storage, Linux, and middleware technologies. Red Hat also offers award-winning support, training, and consulting services. Red Hat is an S&P 500 company with more than 80 offices spanning the globe, empowering its customers’ businesses.

debian is an operating system and a distribution of free software. it is maintained and updated through the work of many users who volunteer their time and effort.

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since 1983, developing the free unix style operating system gnu, so that computer users can have the freedom to share and improve the software they use.