wiki-spaces.org
WikiSpaces 3D is a platform offering a rich collection of user-contributed virtual scenes from around the world. Users can view these scenes and embed them in any project for free.
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wikisky.org
WikiSky.org is an interactive online sky map presenting itself as an interactive sky map. The site links to sections including Getting Started, Inhabited Sky, News@Sky, an astro photo forum, a blog, a FAQ, a press page and an API.
wiktionary.org
Wiktionary provides educational videos, lessons, tutorials, or self-learning resources.
wildwinds.com
WildWinds is a reference and attribution resource for ancient numismatics, covering Roman, Greek, Byzantine and Celtic coins. Coins in its database are not offered for sale on the site. The site provides a database of coin types with attributions and references.
wi-phi.com
Wireless Philosophy (Wi-Phi) provides free videos that introduce the public to the practice of philosophy. Its learning modules and series cover topics such as critical thinking, ethics, epistemology, happiness, punishment, democracy and neurophilosophy, featuring contributions from philosophers and teachers.
wokwi.com
Wokwi is an IoT and embedded system simulator for ESP32, STM32, Arduino, Raspberry Pi Pico, displays, sensors, motors and WiFi, run online in the browser. It also offers options for VS Code, CI and JetBrains, plus a classroom offering used by universities and organizations.
wolframcloud.com
Wolfram Cloud provides educational videos, lessons, tutorials, or self-learning resources.
wolframalpha.com
Wolfram|Alpha is a computational knowledge engine with broad knowledge and deep computational power in mathematics. It provides calculators and answers across elementary math, algebra, calculus, geometry, number theory, discrete and applied math, logic, functions, plotting, advanced mathematics, definitions, famous problems, continued fractions, and Common Core math. Users can get help with math homework, solve specific problems, or find information on mathematical subjects and topics.
wordnik.com
Look up definitions and examples of English words.
wordreference.com
WordReference provides educational videos, lessons, tutorials, or self-learning resources.
wordsafety.com
WordSafety is a service that checks proposed names for unwanted meanings, swear words, or problematic associations across 19 languages, including phonetic matching to identify similar pronunciations that may be problematic. It does not log individual user search inputs, only recording aggregate counts of matches.
wordwall.net
Create interactive learning activities.
apps.gnome.org
A GNOME application for learning and prototyping with GNOME technologies, from first tinkering to building and testing a GTK user interface. It includes live GTK/CSS preview, a library of over 100 examples, support for JavaScript, Rust, Python and Vala, declarative UI syntax, autosave, sessions and projects, code diagnostics and terminal output.
worldbirthsanddeaths.com
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.
worldcubeassociation.org
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.
writeandimprove.com
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.
wumbo.net
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.
tweedewereldoorlog.nl
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.
x86re.com
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.github.io
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.
yameda.me
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.
yell0wsuit.page
yell0wsuit provides educational videos, lessons, tutorials, or self-learning resources.
yellowbridge.com
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.com
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.