Python course

Free text book: How to think like a Computer Scientist
http://www.greenteapress.com/thinkpython/thinkCSpy.pdf

Solving problems with Python
http://cs.colgate.edu/~jsommers/cosc101/html/

Codingbat.com : Java and Python
http://codingbat.com/java/Recursion-1
http://codingbat.com/java