KiCad is a EDA for designing PCBs. It is free, cross-platform and open source!

Getting startet with KiCad: External.

Some things that might be good to know (applies to V4)

1. BOM generation

   Take a look at this (https://github.com/SchrodingersGat/KiBoM)

2. Via stitching

   Take a look at this (https://forum.kicad.info/t/protip-nicer-via-stitching/1103)

3. Add default fields to the parts

   In the Eeschema go to Preferences-> Schematic Editor Options-> Template Field Names-> Add. Then write in what you want.