OpenEd is a fantastic site for educators to create an online course and assign a wide variety of educational resources for students to view. These resources can include: videos, links, sites, and more from such resources as PBS, EdCite, BrainGenie, etc. Recently, they released a free Android/iOS app that works in conjunction w/ their website that allows students to join a course via a unique login code on their mobile devices. Anyone familiar w/ Nettrekker will feel right at home w/ the user interface as can view their classes, resources (rated on a star scale), standard, grade level, etc.
I highly recommend checking out OpenEd by clicking here!!!