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A website offering a real-time statistical simulation of births, deaths, and world population changes on an interactive 2D map and 3D globe. It also includes a personal Life Arc estimate based on age and a simplified U.S.-style actuarial curve, described as a broad statistical illustration rather than an individual or medical prediction. The page is labeled Beta and notes it is best viewed on desktop.
The World Cube Association governs competitions for mechanical twisting puzzles, known as twisty puzzles, including the Rubik's Cube. A selection of these puzzles are official WCA events, and the site provides competition information, records and regulations.
The World Data Center for Solar-Terrestrial Physics, Moscow, a division of the Geophysical Center of the Russian Academy of Sciences, has existed since 1956. It collects, stores and disseminates data on solar-terrestrial physics disciplines, with online data and data search. Its data can be used freely for scientific research and educational purposes.
The World Maritime University describes itself as serving the global maritime community through postgraduate education, research and capacity building. Its site lists programmes including an MSc in Maritime Affairs in Malmö and an MSc in International Transport and Logistics in Shanghai. Academic handbooks for 2025 and 2026 are published in the document section.
World Wide Telescope is a GitHub repository or organization with source code, releases, documentation, or project resources.
Write & Improve is a free service from the University of Cambridge for learners of English to practise written English. Users submit written work and receive feedback within seconds on spelling, vocabulary, grammar, and general style. It offers hundreds of tasks at all levels, and results are linked to the CEFR.
WriteAPrisoner is a platform that connects members of the public with incarcerated individuals seeking pen pals for friendship, support, and potential personal relationships. It also provides free self-help resources for inmates, their families, and friends, including a published self-help guide and a library of printable PDFs covering topics such as education, employment, substance abuse recovery, and maintaining relationships during incarceration.
Wumbo is a math reference site for students, teachers, and enthusiasts. It organizes core concepts, worked examples, formulas, functions, a glossary, notation, operators, symbols, and videos, including a video on quaternions implemented in Python. It offers a contributing membership that funds future videos and resources.
WW2 in 100 Objects is a virtual online exhibition of Second World War-related items. The physical exhibition was on display at Kunsthal Rotterdam until 5 May 2014. The virtual version allows remote access to the exhibition, with full-screen mode recommended for the best viewing experience.
Free Full Source: X-Argus, X-Ladon, X-Gorgon, TTEncrypt, XLog - Educational Purposes
x86re hosts a series of reverse engineering articles. Part 1 gives a brief introduction to RE, executables, compiling, 32-bit x86 syntax, and stack frames. Part 2 covers Portable Executable image file headers and sections.
Xextan is a constructed language with a page of language resources. It points to a wiki and Discord server, the Xextbook as the main learning resource, a dictionary and root listings, texts, and several parsers.
Yale University is a higher education institution founded in 1701. Its mission is to expand and share knowledge, inspire innovation, and preserve cultural and scientific information for future generations. It operates Yale Online, which offers learning opportunities accessible to all audiences, and is marking its 325th founding anniversary with curated stories and resources.
A list of Japanese learning resources for beginners and advanced learners, covering dictionaries, vocabulary, grammar, reading, media, podcasts, games, software and an encyclopedia. Some sections are marked as coming soon.
Yanshan University (YSU) is a university co-constructed by the Hebei Provincial Government, the Ministry of Education and the Ministry of Industry and Information Technology, and a member of the Cooperation Consortium of Beijing High Technology Universities. Its site presents news, schools and departments, academics, international exchange and study-at-YSU information for international students.
YellowBridge is an online bridge to Chinese language and culture, offering resources for learning Mandarin and cultural context for understanding the language. Its tools include a Chinese-English dictionary, character dictionary and etymology, Chinese flashcards, a memory game, HSK preparation, a popup translator, pinyin resources, an animated stroke order guide and a Chinese reading center.
Yeolpumta is a study-focused service operated by Pallo Inc, located in Gangnam-gu, Seoul, Republic of Korea. It describes itself as the beginning and end of studying, and provides public contact details for support via email and telephone.
yetCalc is an open-source calculator application designed for Android devices. It provides basic, scientific, unit conversion, and programmer calculation modes, along with multiple theme options. Currency conversion requires an internet connection, and the app requires Android 9.0 or higher to run.
A website dedicated to language learners that hosts FSI, DLI and Peace-Corps courses, plus Shtooka audio collections and Cortina courses. It also offers tutorials for importing vocabulary lists, digitizing documents and recording word or phrase lists. The site states the FSI and Peace-Corps parts are finished and DLI is on the way.
Yokai.com is an illustrated database and encyclopedia of Japanese folklore featuring ghosts, monsters, and legendary figures. Entries are based on Japanese sources including books, paintings, scrolls, prints, and oral tradition, with text and illustrations by Matthew Meyer. The site is presented ad-free, pop-up free, and paywall free.
Yomitan is a free browser extension that provides pop-up dictionary lookups while reading. It shows definitions, word frequencies, native audio and example sentences, and can send lookups to Anki as flashcards. The extension supports Chrome, Firefox and Edge and runs on Android devices.
Yomu AI is an academic writing assistant for essays, papers, literature reviews and theses. It offers a document assistant for drafting sections, AI autocomplete, editing commands such as paraphrase and summarize, citation finding and formatting, a plagiarism checker, and chat with PDFs and images. Sources can be saved to a library and reused across documents. It is described as free to try with no credit card required.
You Don't Know JS is a GitHub repository or organization with source code, releases, documentation, or project resources.
You-Dont-Need-jQuery is a GitHub repository or organization with source code, releases, documentation, or project resources.
