EdX as well,

- 6-00-1x https://www.edx.org/course/introduction-computer-science-mit... (started)

- 6.00.2x https://www.edx.org/course/introduction-computational-thinki... (March)

All are good and are pitched at various levels of complexity. The Princeton course uses Java. Okay if you're into that sort of language/thinking. MIT is using Python. Found one using lisp, "Systematic Program Design" ~ https://www.edx.org/xseries/how-code-systematic-program-desi...