Education
Useful for learning, teaching, knowledge sharing, or skill development.
277 curated websites
All websites Academic Research Online Learning Practical Tools Creative Tools Explore the World Developer Tools Fun & Games Cultural Heritage Maps & world Science Exploration Health & Living Career Development Shopping & Deals Social & Community Design Inspiration Website Builders Personal Finance
Academic Research
4 websites
ZooniverseThe world's largest people-powered research platform — volunteers classify real research data in the browser, from galaxies and penguins to historical manuscripts, with most projects open without registration.
WikipediaA free, multilingual online encyclopedia that anyone can edit, launched in January 2001 and sustained by reader donations to the nonprofit Wikimedia Foundation; as of 2026-09-02 it spans 348 language editions with over 68 million articles.
NotebookLM (now Gemini Notebook)Google's AI research assistant: answers are grounded only in your uploaded sources, with inline citations, and the same material can become Audio Overviews, mind maps, or flashcards. Renamed Gemini Notebook in July 2026.
SciSpaceSciSpace (formerly Typeset) is an AI research assistant that combines a 280M+ paper database with literature review, Chat with PDF, citation-backed AI writing and reference tools, on a freemium subscription model.Online Learning
23 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.
BrilliantBrilliant is an interactive STEM learning platform — a personal tutor for math and coding with in-house interactive courses and the Koji AI tutor. Freemium with daily limits, English-only, no certificates.
Boot.devBoot.dev is a self-paced, gamified online learning platform focused on back-end development, DevOps, and data analytics career paths, with exercises completed and auto-graded in the browser.
SpeakSpeak is an AI language learning app centered on an AI speaking coach and real-time pronunciation feedback that pushes learners from studying a language to actually speaking it. 7-day free trial, then subscription.
MasterClassA subscription course platform where famous names teach their craft — Ramsay on cooking, Scorsese on film — in cinema-grade short episodes. 200+ classes, annual plans from $120, no free trial. Founded in San Francisco in 2015.Practical Tools
1 websites
Developer Tools
4 websites
Stack OverflowThe Q&A site for programmers, created in 2008 by Jeff Atwood and Joel Spolsky and acquired by Prosus in 2021; voting, reputation, and accepted answers have archived 24M+ programming questions under CC BY-SA.
MDN Web DocsFree, open-source web platform documentation maintained by Mozilla: HTML, CSS, JavaScript, Web APIs, and HTTP, with per-page browser compatibility tables. Online since 2005, edited on GitHub with Open Web Docs and volunteers.
roadmap.shA community-maintained collection of developer learning roadmaps: 80+ career and technology paths as clickable skill trees, each node pairing a brief with curated links; free, with content updates flowing through a public GitHub repository.Fun & Games
3 websites
GeoGuessrGeoGuessr drops players into a random Google Street View panorama and has them locate it on a world map using clues like road signs and license plates. Free accounts get only the Daily Challenge; other modes need a subscription.
Chrome Music LabGoogle Creative Lab's free collection of interactive music experiments — Song Maker, Rhythm, Spectrogram and more — running in any browser with no account. Mostly open source and a staple of music classrooms.Cultural Heritage
5 websites
Shidian GujiA free digital reading and editing platform for pre-modern Chinese books by Douyin Group (ByteDance) and Peking University, offering full-text search, page-image comparison and machine-assisted translation across 73,000+ titles.
Guwendao (formerly Gushiwen)A classical Chinese literature reference site founded in 2011 and renamed Guwendao in late 2025; it indexes poems, prose, classics, and famous lines with translations, annotations, and appreciations, free to read without an account.
Chinese Text ProjectOpen-access digital library of premodern Chinese texts maintained by Donald Sturgeon since 2006: over 30,000 titles focused on pre-Qin and Han works, with aligned Chinese-English parallel texts, a dictionary, source scans, and an open API.
Zdic (汉典)Free online Chinese dictionary launched in 2004: each entry combines the Kangxi Dictionary, Shuowen Jiezi, Mandarin Dictionary, phonology, dialects, and glyph origins on one page, plus classical text, poetry, and calligraphy sub-sites.
Google Arts & CultureGoogle's online culture platform built with 2,000+ museums and archives: gigapixel artwork images, Street View walkthroughs and curated exhibitions, free in the browser. Began as Google Art Project in 2011, renamed in 2016.Science Exploration
3 websites
NASA Eyes on the Solar SystemA browser-based 3D solar system simulation from NASA's Jet Propulsion Laboratory: driven by real mission data, it replays 150+ NASA mission trajectories from 1950 to 2050, free with no account; sibling apps cover asteroids and exoplanets.Health & Living
1 websites
Career Development
2 websites
NowcoderA Chinese job-hunting prep platform for new graduates and programmers, combining real company written tests, online coding practice and contests, an interview-experience community, and campus recruiting info.
LeetCode China (力扣)LeetCode China (leetcode.cn) is the Chinese edition of the LeetCode online judge, offering thousands of algorithm problems, online judging, weekly contests, and company interview question banks in a Chinese-first interface and community.Design Inspiration
2 websites
Checklist DesignA curated library of interface design checklists by designer George Hatzis, covering websites, web apps, mobile, design systems and flows. Free with no sign-up, plus a Figma plugin with AI reviews and an open-source AI agent skill.
Laws of UXA UX psychology reference by product designer Jon Yablonski: 30 psychology laws relevant to interface design as visual cards, each with design takeaways, real product examples, and cited academic origins. Free, in five languages.