New Old Stock is described as 'Vintage photos from the public archives free of known copyright restrictions'. There are more than 25 alternatives to New Old Stock, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and iPhone. The best alternative is Shutterstock. It's not free, so if you're looking for a free alternative, you could try motosha or FoodiesFeed. Other great sites and apps similar to New Old Stock are Zoommy (Paid), Getty Images (Paid), Visual Hunt (Free) and Negative Space (Free).