Did Tupac support any charities

Yes he did and in fact he had a lot own charities, free toll service for kids to reach him, even changed his publishing company name Joshua's Dream

In 93, Tupac recieved a letter from the parents of a dying boy, named Joshua. They said it was Joshua's last wish to meet Tupac. Tupac flew to Maryland to meet Joshua. Soon after Joshua's death Tupac renamed his publishing company from Ghetto Gospel Music to Joshua's Dream.