Most of the time, especially for quick-fix projects, I use a free 3D modeling tool called TinkerCAD. It's incredibly simple and easy to use.

You are stuck at home quarantined and you want to do some Arduino projects. The problem is you don’t have all the cool devices you want to use. Sure, you can order them, but the stores are sl… ...

Of course, you could do this trick with any online simulator, but Tinkercad is nice because it is easy to use, looks real, and doesn’t cost the students a dime. [Ben] mentions there are some ...