Subjects: Maths, History, Science (Chemistry, Biology etc), Finance and Economics, Programming
I think that Khan Academy is one of the most amazing educational resources ever built.
It is completely free.
It provides an excellent learning tree that lets students see what knowledge they have, and are perhaps missing, and guides them through this tree towards higher level subjects – giving a very clear picture of where they are heading and where they have come from. This really helps to put the learning in context.
There is a broad range of subjects available, although I feel that Maths is the deepest of these. All areas are constantly expanding.
Reporting to parents is good, although to be honest I wish that I could get a little more detail than I currently can.
The learning videos are simply without compare – Khan is an absolutely amazing teacher. There is also an extensive range of exercises available for most areas that helps to cement the learning and ensure that the learning is not just a passive video-watching exercise.