General Programming Practice

• http://rosettacode.org/wiki/Main_Page
• http://www.ia-contest.com/
• http://projecteuler.net/
• http://codility.com/
• https://www.topcoder.com/
• http://thecodelesscode.com/contents
• http://robots.thoughtbot.com/post/159808605/coding-without-ifs Anti If Campaign
• http://codingbat.com/