E-Source Home  >  Language Learning Online Database Categories Duolingo     Duolingo is a free language-learning platform that includes a language-learning website and app, as well as a digital language proficiency assessment exam. LinkedIn Learning     LinkedIn Learning is an online learning platform for in-demand skills with over 16,000 courses. You may watch an entire course, or individual videos – some are as short as four or five minutes. LinkedIn Learning’s resources fall into three areas: Business, Technology, Creative. Udemy     Learn and improve skills across business, tech, design, and more. Includes 10,000+ on-demand video courses in multiple languages.