Operating Systems
1. Ubuntu
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Ubuntu is one of the most popular Linux distributions available, it comes in both desktop and server versions. Linux distributions come with a huge library of software included, so you'll have access to all the apps you'll need right away—and they're free. Ubuntu offers thousands of apps available for download. Most are available for free and can be installed with just a few clicks.
2. Zorin OS
Zorin OS is a multi-functional operating system designed specifically for newcomers to Linux. It's based on Ubuntu Linux, so you can rely on it for rock-solid performance, dependability and support.
Zorin OS operating system gives you the ultimate desktop experience. Some of the advantages of Zorin OS:
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No risk of getting viruses
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It's super-fast and light on resources
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An easy to use and familiar desktop
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Customizable user interface thanks to our Look Changer
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Stable as it is based on the robust Linux operating system
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All the software you'll ever need out of the box
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Extremely versatile and customizable Open Source software
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Open Source software licensed by the GNU GPL
3. Linux Mint
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If your workstation is crammed with multiple desktops, Linux Mint should find a mention amongst them even if it doesn’t happen to be your main production desktop. A great easy-to-use alternative, for Windows users. It's safe and reliable. Thanks to a conservative approach to software updates, a unique Update Manager and the robustness of its Linux architecture, Linux Mint requires very little maintenance (no regressions, no antivirus, no anti-spyware...etc).
4. Fedora
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Fedora has a reputation for focusing on innovation, integrating new technologies early on and working closely with upstream Linux communities Fedora Workstation is a polished, easy to use operating system for laptop and desktop computers, with a complete set of tools for developers and makers of all kinds.
5. OpenSUSE
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OpenSUSE is a free and Linux-based operating system for your PC, Laptop or Server. The openSUSE distribution is a stable, easy to use and complete multi-purpose distribution. It is aimed towards users and developers working on the desktop or server. It is great for beginners, experienced users and ultra-geeks alike, in short, it is perfect for everybody!
Website: https://www.opensuse.org
Other open source operating system:
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Syllabe OS, Steam OS, React OS, Debian