Don't forget Fritzing! While Fritzing is most commonly used for making very professional-looking diagrams of breadboard layouts, it's also a complete and extremely capable EDA suite. I've done several boards in Fritzing, and taken a few of those to production (> 1000 qty).

Also, unlike Eagle and Orcad and circuit studio, Fritzing is free as in beer and speech. Same with KiCAD, but the learning curve on Fritzing is just so much easier.