Wow, its really good. Free and cross platform!!

Ive been using Mendeley desktop for well over 5 years now and its been amazing. Now that the iOS version has had some time to mature this is by far the best pdf reader, organizer, annotater, reference manager and friend you could ask for. Did I mention its all free and runs on windows OS X and Linux. No matter where I login from I have all 800+ articles at my disposal. Get it now!

JASP1111 about Mendeley (PDF Reader)