Udemy offers a massive collection of online courses which can be accessed by registered users. Computer development, business, IT, marketing and photography are but a handful of examples. This site is free to join and the user will only pay for the courses that he or she selects. There are currently more than 45,000 courses available and these are taught by accredited instructors. Class sizes are small and applicants can learn at their own pace, ideal for busy lifestyles.