Personally I'm a sucker for anyone who tries to do stuff with kids facing serious things like cancer and whatnot, and I personally give very generously to the make a wish foundation every year. The video at the top of the page gives a peak at Eli Manning's generosity to the children's wing at the hospital.
With that said, after reading through everyone's charity profile, I can't vote give the award to anyone other than JJ Watt. The sheer weight of the 37 million raised for the hurricane relief plus what he does listed here:
J.J.'s dedication to charitable service began at a young age when the thought of being in the NFL was still just a dream. He started the Justin J. Watt Foundation in Wisconsin in 2010 out of a desire to help underserved kids. His personal motto of "Dream Big, Work Hard" culminated into a mission that he continues to use to impact communities nationwide. The foundation has provided over $3.4 million in funding to middle schools and organizations that have insufficient funding for after-school athletic programs or no after-school athletics whatsoever for 6th - 8th grade children. While his fans enjoy reading about J.J.'s community efforts, his favorite moments typically take place behind the scenes. He lives for the days that he is able to sneak into the back door of a local hospital to spend an afternoon bringing smiles to children receiving care. In addition, J.J. regularly works with organizations, such as Make-A-Wish, to create special experiences for children whose only desire is to spend the day with him. J.J. has shown passion and authentic care for his teammates, coaches and supporters, and that same spirit applies in his charitable initiatives and his desire to help others reach their goals and achieve their dreams.