This course is a awesome mine of information and knowledge on dynamical systems and chaos. It starts at the very beginning by explaining the mathematical bricks necessary to understand the following units, but it's not a heavy mathematical course.
Quite the opposite. The lead instructor David Feldman is always able to make even the more complex parts of this mooc easy to understand.
David has also developed a well featured web software for visualizing all the course material: equation orbits, Butterfly Effect, bifurcation diagrams and Strange Attractors patterns.
If you're a programmer, you can complete some of the advanced (but optional) exercises using the language of your choice. Here's my version in Python:
In short this mooc has been a wonderful mathematical trip.