https://lagunita.stanford.edu/

Stanford’s online learning platform has a new name and location: Lagunita is now available at http://lagunita.stanford.edu.
Lagunita is the new name for what used to be called Stanford OpenEdX at class.stanford.edu —Stanford’s instance of the open-source release of the edX platform, which Stanford engineers have been collaborating on since April 2013 as part of the Stanford Online initiative.