When it comes to publishers, few names stand out in the technical world like O'Reilly. With literally thousands of books and videos, there are topics ranging from Programming to Business, and Fitness to Photography. Not only does O'Reilly print under its own name, but it also owns several other brands including: Wiley, Packt Publishing, No Starch Press, and more. Almost every developer probably has a small stack of books with the trademark line-drawn animals on the covers.