Welcome to the NEOS Guide, the companion site to the NEOS Server. The NEOS Server is a free internet-based service for solving numerical optimization problems. Visit the NEOS Server web site to access 60 state-of-the-art solvers in more than a dozen categories. This NEOS Guide web site complements the NEOS Server, showcasing optimization case studies, presenting optimization information and resources, supplying documentation on the NEOS Server resources, and providing background information on the NEOS Server. If you are new to the NEOS Server, check out the User's Guide to the NEOS Server to get started.