Here is my (long and very unreal) edX whishlist:
Robot Mechanics and Control, Part I
Electronic Interfaces: Bridging the Physical and Digital Worlds
Innovation and Commercialization
How innovative products are made. Not a must but it is interesting.
Economics of Cybersecurity
With 2 major breaches in the last six months cyber security is a hot topic alright. Impacts on the economy are starting to show, so if you care about that stuff this seems good.
Mastering Quantum Mechanics
Always wanted to be able to say the above. A dream coming true!
Signals and Systems, Part 2
No introductions here. You can skip part one if you’re already familiar with the basics.
Circuits and Electronics
Refresh your circuits skills and knowledge. Basic stuff again.
Introduction to Aeronautical Engineering
Introduction to Solid State Chemistry
Introduction to Computational Thinking and Data Science
The Science of Happiness
Εntrepreneurship 101: Who is your customer?
Building Mobile Experiences
Discrete-Time Signal Processing
This list is a completely personal collection choices resulting from a 5 minutes scrolling research. You can surely find something that interest you out there.
Other sites that provide courses are:
Hope I helped.