This was my first OpenSCAD project so it's probably not a wonderful resource.
Bottom part of a white board marker holder. It goes over a cubicle wall and holds two markers and an eraser.
This is the top of the white board marker holder. I used cyanoacrylate to glue them together. Another approach might be to put some 1.8 mm holes in the the design and "rivet" them together with filament.
The holds a small, rectangular USB Hub to the back of a table so that the weight of the cables don't pull it out of place.
This is a modification of a file from www.myminifactory.com which goes over a cube wall and holds things. My modifications improve the variable comments (IMHO) and clear up some microthin artifacts visible in OpenSCAD.