Categories
A free encyclopedia that helps younger readers explore philosophy by subject, historical period, and tradition.
Offers visual, interactive explainers of landmark AI and machine learning papers for readers who want to understand their ideas and systems.
An iPhone game that teaches world flags through quizzes, look-alike drills, and spaced repetition.
Delivers a daily coding question to developers for focused problem-solving practice.
Publishes guides and reference material for people using AI models and coding agents.
A learning app that helps developers build programming skills through short courses, quizzes, and spaced repetition.
Helps teachers and homeschoolers create printable K - 2 coloring worksheets from prompts.
Maps and lets researchers search Roman inscriptions with AI-extracted personal-name data.
Teaches personal finance through short, country-specific lessons and quizzes on iPhone and Android.
Helps people practice public speaking with live listeners, structured feedback, recordings, and AI coaching notes.
A digital library that translates and organizes ancient texts for scholars, readers, and AI systems.
Helps learners, teachers, and linguists visualize word-by-word translations and export alignment diagrams.
A browser-based coding workbench that runs code, visualizes execution, and provides interactive data structures and algorithms editorials.
Guides aspiring software developers through data structures, algorithms, and system design with lessons, practice, and progressive hints.
An AI tutor app helps students study and prepare for exams by coaching them through problems using a device camera.
Verifies scholarly citations by resolving identifiers and checking whether cited titles match their records.
Helps researchers find and evaluate RT-qPCR primer pairs for genes across 40 species.
Lets people create and take quizzes and track progress locally without accounts or cloud storage.
A free video class teaching developers to use Claude Opus for complex coding tasks and agent workflows.
Helps artists practice light and shadow with timed value studies using reference images or their own photos.
A browser tool for exploring Japanese two-kanji compound words with filters and keyboard or touch navigation.
An interactive console presents historical Joseon court observations as operational telemetry, with translations and source links.
Shows the relative size of things using a human as a scale reference.
Adds readings to Japanese text and documents to help learners read kanji.
Helps parents across the GCC find, compare, and contact schools and nurseries using verified information and fee data.
Analyzes Anki flashcards for factual errors and quality issues, then emails audit results.
An interactive visual guide helps developers understand how large language models work.
Helps people memorize Bible verses with spaced-repetition flashcards and progress tracking.
An interactive tutorial that teaches ciphers through a step-by-step path to building an Enigma machine.
A macOS AI overlay that transcribes interviews and gives engineers contextual coding interview prompts.
Helps medical students prepare for exams with spaced-repetition cases, mock exams, and patient simulations.
A browser game that helps players build vocabulary by matching words with their synonyms and antonyms.
Interactive walkthroughs teach Kubernetes internals to developers and cloud-native learners.
A global challenge where engineers practice solving realistic production incidents.
An interactive canvas for building geometry and math models with typed commands.
An interactive tool for exploring atomic orbitals and switching to a Bohr model.
Provides senior software engineers with interview practice drills, flashcards, system design simulations, and study guides.
Turns notes and readings into editable flashcards with scheduled reviews for independent learners.
Provides interactive OSINT challenges for people practicing geolocation, image investigation, digital forensics, and research.
Provides private AI coaching and short practice drills to help people improve high-stakes communication.
An interactive algorithm learning site teaches data-structure patterns through explanations, animations, and practice problems.
Helps programmers train execution instincts and syntax intuition with AI-generated quizzes across 36+ languages.
A mobile-friendly math puzzle game where players connect numbers and operators to match a falling number.
A multiplication practice game that helps children learn times tables through timed play, progress tracking, and badges.
Helps musicians identify and define foreign-language terms on sheet music using a phone camera.
Provides customizable graph paper and related templates for printing or downloading as PDFs.
An AI study tutor that helps students revise through voice or text explanations and active-recall questions.
An interactive historical atlas for exploring Crusader-era sites, fortifications, and medieval territories across the Holy Land.
Helps learners practice algebra through guided lessons, interactive equations, and tournaments.
Checks scholarly references against publication records and flags mismatches or retractions.
A reference directory cataloging known systems capable of computation, from hardware to unconventional substrates.
A browser game for practicing code typing across programming languages and competing on leaderboards.
Discovers random articles across Wikimedia projects in more than 25 languages.
Helps users research questions by finding scholarly sources and displaying citations.
Lets startup founders practice YC interviews with simulated partners and receive transcript-based feedback.
A local CLI and MCP server lets AI clients search and edit flashcards in the Space app.
A daily word-order puzzle that helps language learners practice sentences in a target language.
Translates between English and Spanish with culturally flavored phrasing.
A free app that teaches Spanish beginners through visual flashcards, readings, and pronunciation practice.
Helps Japanese learners look up kanji and study them with spaced repetition and progress tracking.
A browser-based tool for practicing drum exercises with notation, adjustable tempo, randomization, and a timer.
A daily language trivia game for practicing reading skills in nine languages through themed puzzles.
Helps children and families animate hand-drawn characters, add movement, and record voices for creative learning.
An interactive 3D browser explorer for galaxy catalogs and cosmic-web filaments.
A browser-based typing study lets readers type through classic books, speeches, essays, and writing prompts.
Creates personalized daily micro-courses and uses an AI tutor to help people learn topics in short sessions.
A world map quiz that asks players to name highlighted regions and tracks their score.
An interactive guide helps learners understand modern AI concepts through visual experiments and optional coding notebooks.
Helps homeschool families find curriculum recommendations based on their answers to a few questions.
A Windows laboratory for learning and experimenting with Intel 4004 emulation, assembly, and peripherals.
Provides browser-based LBO, DCF, M&A, private equity, and venture capital finance simulations for students.
Researchers can search and explore historical American newspaper articles with AI tools and curated collections.
A free Windows app that translates on-screen text and builds vocabulary from users’ reading.
Turns screen recordings into interactive step-by-step guides for product onboarding, support, education, and internal procedures.
Teaches probability, statistics, linear algebra, and calculus through interactive lessons, visual demos, and quizzes.
Provides Mandarin-learning apps and browser tools for sentence patterns, tones, vocabulary, and pronunciation.
Helps developers prepare for coding interviews with adaptive questions organized by technology and skill level.
Provides AI-led mock interviews and résumé tools for job seekers across multiple industries.
A CLI tutor that helps Go developers practice algorithms and concurrency with AI-generated problems and reviews.
Teaches beginners creative coding with p5.js through lessons, challenges, labs, and visual experiments.
An interactive guide that teaches beginners how wind, sails, and keels move a sailing boat.
An interactive 3D atlas for exploring geographic, cultural, institutional, and astronomical information.
Shows live NASA solar imagery, moon phases, and space weather data on the web and mobile devices.