Apart from the promoted online courses from Stanford there is also other courses of interest that are not promoted but still access to lectures and notes. Notable courses from the Stanford School of Engineering include the following.
Introduction to Linear Dynamical Systems
Convex Optimization I
Convex Optimization II
Stanford isn't the only school that is promoting their lectures online for free use. A lot of schools are promiting open learning and collaboration through what is called Open Courseware. Some notable schools inlcuded.
As an analytics professional for many years I've found honing your skills to be very important for your career. Now more than ever it is easier to do with schools opening up their classes for everyone. I strongly recommend finding areas of expertise that you are passionate about or want to learn and find the schools that promote them online.