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I have used eagle, and am aware of kicad and geda. Eagle is pretty easy to pick up and is popular with the maker crowds. Sparkfun has some nice tutorials and if you can tolerate the website instructables has some too.
I've been meaning to try the latter two but haven't had the time yet. From my understanding KiCad is more beginner friendly while geda is tuned towards the power user.. that's not to say kicad isn't powerful in it's own right, just that you may not have as much customization available to you.