KiCad

KiCad allows to open Gerber files and build netlists, as well as create electronic diagrams and printed circuit boards.

The installment is quite easy to set up though you may have to arm yourself with a lot of patience because it does take up to 5 minutes to complete.

The program has a basic and intuitive GUI, with original but not so modern toolbar icons, but which offers good time response to user actions. Also, it doesn't have advanced options or other themes to choose from than the default one.

One of the incorporated features is the 3DViewer that can be used to scan your design. It allows you to rotate and pan around to inspect details, while also being able to customize the appearance of the board.

With KiCAD, users are able to realize complex PCB layouts and choose from 32 copper layers. By using the Push and shove router, users can design the boards faster, while it makes sure that DRC constraints are respected.

In conclusion, I can definitely say that KiCad is a reliable tool for designing PCB layouts. However, the auto-routing tool is too complicated, the libraries are poorly designed, and the software often tends to be glitchy.