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Recent System Monitor mockup by the GNOME design team
(gitlab.gnome.org)
The GNOME Project is a free and open source desktop and computing platform for open platforms like Linux that strives to be an easy and elegant way to use your computer. GNOME software is developed openly and ethically by both individual contributors and corporate partners, and is distributed under the GNU General Public License.
Some parts of this look very windows like (the CPU cores page for example). But that is not a bad thing as it does function well