This was very clearly mentioned in the article, the project was even sponsored by the board fab used (PCBWay). There are others, and prices for entry-level hobb

This was very clearly mentioned in the article, the project was even sponsored by the board fab used (PCBWay). There are others, and prices for entry-level hobbyist-size boards are low. Two freely available software options to Goog are KiCAD and EasyEDA.