libreoffice is great for drawing out networks
- is free
- and has good icons
Best used with the libreoffice-draw package and the VRT Network Equipment Gallery extension for a small set of high quality Network icons images optimized for libre.
There were no sheetmetal cutout frames or GPU icons, unfortunately.
to install:
sudo apt update
sudo apt install libreoffice
sudo apt install libreoffice-draw
https://extensions.libreoffice.org/en/extensions/show/vrt-network-equipment)is where you can get the extension, or just google libreoffice network icons and you will find it.
Super easy install: just double click the extension and it will open with libre. Open the draw app and head to Gallery, scroll to the bottom to see the extension package.