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I viewed classes from all three mentioned above and found Prof Sedwick's classes to be very structured and to my style/liking. Prof. Roughgarden is "free flowing" and may require fast thinking to follow him. Prof Demaine's classes gets very mathematical and I found myself sometimes lost in Greek symbols. But Prof. Demaine is very thorough in building the theory.

[1] Prof Sedwick: https://www.coursera.org/course/algs4partI

As @carise said, the content may be gone after June 30th and if you want to download, you can do so using coursera-dl tool

https://github.com/coursera-dl/coursera-dl

[2] Prof Roughgarden: https://www.coursera.org/learn/algorithm-design-analysis

[3] Prof Erik Demaine (MIT OpenCourseware): https://www.youtube.com/playlist?list=PLUl4u3cNGP61Oq3tWYp6V...

There are videos of MIT's Prof Erik Demaine's Intro to Algo's from various semesters. I think any one should do.