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CentOS is built from publicly available open source SRPMS provided by RedHat. CentOS conforms fully with the upstream vendors redistribution policies and aims to be 100% binary compatible. (CentOS mainly changes packages to remove upstream vendor branding and artwork).
Debian is a free operating system (OS). Debian uses the Linux kernel (the core of an operating system), but most of the basic OS tools come from the GNU project; hence the name GNU/Linux. Debian GNU/Linux provides more than a pure OS: it comes with many thousand packages of precompiled software bundled up in a nice format for easy installation.
The Fedora Project is a Red-Hat-sponsored and community-supported open source project. It is also a proving ground for new technology that may eventually make its way into Red Hat products. The goal of The Fedora Project is to work with the Linux community to build a complete, general purpose operating system exclusively from free software.
Ubuntu is a desktop Linux operating system, freely available with both community and professional support.
Ubuntu will always be free of charge.
Ubuntu is shipped in stable and regular release cycles; a new release will be shipped every six months. You can use the current stable release or the current development release. A release will be supported for 18 months.
Ubuntu is suitable for both desktop and server use. The current Ubuntu release supports Intel x86 and AMD64 architectures.

Last update of package list: Fri Nov 16 07:46:00 2018