Coding websites
Challenges
- http://www.coderbyte.com/ - haven't tried this one yet
- http://www.geeksforgeeks.org/
- https://www.codechef.com/
- http://www.topcoder.com/
- https://www.codingame.com/start
- https://www.hackerrank.com
- http://rosalind.info/about/
- http://cryptopals.com/
Courses
- https://www.codeschool.com/ - Try Ruby, Try Git, Rails for Zombies Redux
- FreeCodeCamp
- TeamTreeHouse
- edX
- http://programming-motherfucker.com/become.html