The Numerical Recipes books are developed by Numerical Recipes Software and published by Cambridge University Press. The website provides information on how to purchase the books, which are part of a series entitled "Numerical Recipes: The Art of Scientific Computing." "Numerical Recipes" is also a copyrighted computer software included in those books and sold separately. The books and software are available in a variety of computer languages, such as C++, C, and Fortran, and provide routines and recipes, along with explanations and "tricks and tips for scientific computing." Visitors can download the whole C (or Fortran) book for free, although the publisher hopes that after sampling a few sections people will buy the book. The website also provides news updates on the products as well as access to the Numerical Recipes Forum, where those interested in scientific computing can interact, ask and answer questions, and trade tips and tricks. Registration is free and a prize is offered to encourage people to join and offer valuable comments.