The PCB design software market is admittedly a little stagnant. Newcomers often traverse old forum posts where PCB veterans suggest the same few design applications for the same few superficial reasons. The bottom line is that until recently, there were only a few good offerings and most engineers choose by experience or comfort with a particular brand of PCB software.
EAGLE is one very popular PCB design software created by Germany-based Cadsoft Computer GmbH. The name “EAGLE” is almost ubiquitous with amateur PCB design, probably due partly to its freeware option but certainly mostly due to the fact that everyone keeps mentioning it whether for better or worse. Yeah, I’m guilty too.