Little eraser thingy I did a while ago on OpenSCAD for me an a teacher of mine but never shared
Rounded corners use code by Daniel Upshaw
The box is an edition of hansamann's box, as credited in the file. My edition of this box also takes advantage of the same aforementioned Daniel code.
As for my part you can do whatever you want with this (as long as you don't use it for evil or something), but I'm not really sure what the other folks's part is licensed as