The first three items on the list are MOOC providers - Coursera, Udemy, and EdX - and these are followed by slightly more specialist apps - Duolingo and Khan Academy. LinkedIn Learning i the main professional app, and a number of tools - Photomath, Quizlet, Sololearn and Brainly - round out the ten. By 'top' here the author probably means something 'most popular'. I don't really focus on apps for mobile phones, because these then to be closed and platform-dependent, but there is a whole world of them.
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