Skillshare is an American online learning community for people who want to learn from educational videos. The courses, which are not accredited, are available through subscription. The majority of courses focus on interaction rather than lecturing, with the primary goal of learning by completing a project.

Stack Overflow is a question and answer site for professional and enthusiast programmers. It is a privately held website, the flagship site of the Stack Exchange Network, created in 2008 by Jeff Atwood and Joel Spolsky.