Coursera

Founded by Stanford professors Andrew Ng and Daphne Koller in 2012, Coursera partnered with 300+ universities and companies to offer everything from free audit courses to full master's degrees. Their Google Career Certificates alone have enrolled over 10 million learners. The platform's completion rates crush the industry average because their course design actually respects how adults learn — short videos, immediate quizzes, peer-graded assignments. The $59/month Plus plan unlocks 7,000+ courses.