There are plenty of very good MOOCs on algorithms -

1. https://www.coursera.org/course/aofa

2. https://www.coursera.org/course/algs4partI

3. https://www.coursera.org/course/algo

4. https://www.coursera.org/course/algs4partII

5. https://www.coursera.org/course/algorithmicthink