EAGLE is the well know CAD application for designing PCBs.

https://www.autodesk.com/products/eagle/free-download

Hackaday Tutorial

• Introduction

• Part 1

• Part 2

• Part 3

Packages

• Sparkfun library for many common parts (https://github.com/sparkfun/SparkFun-Eagle-Libraries) ¨

• IAD library  https://github.com/IAD-ZHDK/IAD-Eagle-Library

Design Rules

• Use Sparkfun Rules as default (https://github.com/sparkfun/SparkFun_Eagle_Settings)

• Draw 32mil wires

• Change Clearance also to 32mil

Ground Plate

• Draw a Polygon around the PCB

• Select Info and Set Isolate to an appropriate value

• Select "Ratsnest" from the Toolbar to calculate the ground plate