Online Learning
Learn through courses and practice: free classes, interactive simulations, and drills like coding and typing.
187 curated websites
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Online Learning
13 websites
ScratchA free block-based coding platform created at the MIT Media Lab and now run by the nonprofit Scratch Foundation. Build games, animations, and stories in the browser and share them with a global creative community.
Khan AcademyA free online learning platform run by a US 501(c)(3) nonprofit, offering courses from pre-K through early college plus official free SAT, LSAT, and MCAT prep — no ads, funded by donations.
PhET Interactive SimulationsFree interactive science and math simulations from the University of Colorado Boulder, covering physics, chemistry, biology and more, usable online or offline, translated into 100+ languages, with open-source code.
DesmosA free online graphing calculator and math tool suite from Desmos Studio, covering function plotting, geometry, scientific and matrix calculation, 3D graphs and a Notebook, with sliders, sharing and built-in accessibility.
MonkeytypeA free, open-source typing test and practice website known for its minimal design and unusually deep customization, with multiple test modes, hundreds of language word lists, and optional accounts for tracking progress.
freeCodeCampA donor-supported nonprofit offering free interactive coding courses, project-based certifications, a tech publication and a community forum — all content and certificates free.
DuolingoA free, gamified learning platform opened to the public in 2012, officially listing 40+ languages plus math, music and chess courses; it also runs the Duolingo English Test, accepted by more than 6,500 institutions worldwide.
CourseraAn online learning platform founded in 2012 by Stanford professors Andrew Ng and Daphne Koller, partnering with 350+ universities and companies; NYSE-listed since 2021, merged with Udemy in May 2026.
China University MOOC（中国大学MOOC）A Chinese MOOC platform launched in 2014 by Higher Education Press (icourse) and NetEase under the Ministry of Education's elite open-course program; courses are free to study, with paid verified certificates.
TEDA nonprofit-run video platform built around short conference talks. As of 2026-09-02 the TED.com library indexes 7,641 free talks with volunteer-made subtitles in 115 languages, alongside the TEDx network, TED-Ed lessons, and 25+ podcasts.
ExercismA free, ad-free coding practice and mentoring platform with 83 language tracks and 8,600+ exercises. Solve in the browser or via CLI, get automated analysis, and request free mentor feedback. Run by a UK not-for-profit; account required.
ForvoA crowdsourced pronunciation dictionary with native-speaker recordings for nearly 6 million words in 430+ languages, filterable by accent with community voting. Listening is free; contributing requires an account; non-commercial use only.