Free Online Course Materials. Khan Academy. Free Online Classes. Plan Your Free Online Education At Lifehacker U (2H 2013 Edition) Your education doesn’t have to stop once you leave school and university — freedom from the classroom just means you have more control over what you learn and when you learn it. The winter months are approaching and you’ll be indoors anyway, so gain new knowledge with our latest Lifehacker U listing of some of the best free classes available online. Studying picture from Shutterstock As you may remember from previous Lifehacker U posts , many universities offer free classes year-round, while others are tied to a specific time period.