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App for creating drawings and blueprints
(infosec.pub)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
FreeCAD is good, but maybe more complicated than you're looking for.
You might want to try draw.io / diagrams.net . It can be used in the browser or as a standalone application
Second draw.io - I've done lots of diagrams with VSCode and the draw.io plugin