UMD has a number of resources available to its students.
Testudo is the official website of the University of Maryland Office of the Registrar.
Within Testudo, you can find information on your registration status, schedule, degree audit, and many, many more.
PlanetTerp provides resources on classes and professors at UMD. It includes a rate-my-professor style ranking of professors throughout the univeristy, as well as a lookup for past grades and class statistics.