This is something I slapped together in 20 minutes and then 3d printed at 24 hours per bracket. It's not much, to say the least, but it illustrates the blue collar CAD capabilities of FreeCAD. I wanted a place to store the laptop to get it off the desk surface.
In under a week, I was able to design and print enough brackets, hooks, and cubbies to completely organize the desk. Each piece took 20~45 minutes to design and many, many hours to print.
These brackets can be printed at 20% infill with PLA (5 layers, top and bottom). It takes a large format printer. These brackets can support a 17", heavy, laptop. I have a smaller laptop that uses much smaller brackets (10mm thickness and 10% infill). The spreadsheet can be adjusted to suit the device.
The lights were also designed in FreeCAD and 3d printed in clear PETG. The design can be found on Thingiverse (search for "ikea lack")
Headphone hangars, same deal...
OS: Manjaro Linux (KDE//usr/share/xsessions/plasma)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.20209 (Git) AppImage
Build type: Release
Python version: 3.8.2
Qt version: 5.12.5
Coin version: 4.0.0
OCC version: 7.4.0
Locale: English/Canada (en_CA)