Categories
A Japanese reading app with dictionary lookups, sentence explanations, and flash cards for learners.
Interactive explainers help readers understand computer science and engineering concepts by changing inputs.
An illustrated learning guide that explains machine learning and LLMs without requiring coding or advanced mathematics.
Turns vocabulary lists into scenario-based videos for language learners to practice words in context.
An interactive physics learning tool that visualizes motion through guided scenarios.
Teaches Vim through hands-on editing challenges in a browser-based editor.
A video library of short clips sharing perspectives from founders, artists, designers, and other groups.
Finds books recommended in Hacker News comments and lets readers browse, sort, and save them on their device.
An interactive educational publication explaining complex topics through detailed, illustrated chapters.
Lets users search and explore arXiv papers shared on Hacker News and rank them by commenter activity.
An interactive guide teaches users how to operate and program the Roland AIRA Compact T-8 Beat Machine.
A browser-based school for practicing beatmatching and training your ears.
Offers daily Bible puzzles and verses for people who want to engage with scripture through games.
Helps ham radio learners prepare for FCC exams with practice tests, flashcards, and progress tracking.
Helps developers prepare for coding interviews with curated problem sets, pattern guides, and progress tracking.
Helps technical interview candidates practice interviews and identify weaknesses in their reasoning.
An interactive game that teaches Chinese character history by having users guess meanings as characters evolve.
Creates Anki decks and spoken audio drills for language learners using AI and text-to-speech providers.
Builds personalized computer science learning roadmaps with AI tutoring, practice, and quizzes for learners.
An interactive 3D exploration of a proposed space city, with guided tours and simulations for curious visitors.
Teaches electronics through interactive circuit simulations, lessons, calculators, and a glossary in the browser.
A mobile geology app that overlays geologic maps on landscapes and explains the rocks, their history, and nearby formations.
Helps language learners read bilingual stories and convert their own books or PDFs into parallel texts.
A web-based e-book reader that translates books and answers questions using their source text.
Helps amateur radio learners practice Morse code and prepare for FCC exams in a browser.
Helps language learners practise and remember words and grammar from text they translate or import.
Helps learners study math with mastery-gated concepts, generated problems, and mastery checks.
A web app for Bible study that uses AI voice conversations and Greek and Hebrew sources to explain Scripture in context.
A collaborative wiki documenting open problems posed by Paul Erdős for mathematicians and number theory enthusiasts.
Developers compete in timed head-to-head algorithm challenges and can spectate matches and view leaderboards.
A course that teaches formal methods to working engineers.
Helps chess players analyze their games and follow personalized training plans with puzzles, coaching, and practice games.
Teaches piano through short lessons and familiar songs in a musical adventure.
A macOS app that helps people learn or teach languages using AI analysis of shows, movies, videos, and podcasts.
Measures musicians’ intonation across tuning systems and tracks changes between practice sessions.
Provides seeded typing practice with ranked races, rooms, and contests.
A free online trainer that teaches Morse code through audio lessons, practice drills, and a telegraph key.
A quiz app that helps JavaScript developers practice reading code through questions and explanations.
An interactive chart maps the history and branches of five religions for readers exploring religious history.
An interactive learning platform for SQL, Python, and other technical skills through browser-based coding lessons and projects.
Turns Anki decks into spoken flashcard reviews with AI tutoring while walking.
An interactive browser app for exploring Mandelbrot and Julia sets with zooming and custom color palettes.
Provides a corpus, scripts, and evidence for researchers testing a Semitic reading of Linear A.
An educational guide to photography that explains how cameras work and includes a photo walk.
An interactive game that teaches loop invariants through puzzles.
An interactive guide explaining how GLP-1 drugs affect the body for people learning about these medications.
A desktop math plotter for graphing functions, sequences, parametric equations, and imported data.
A trivia game that tests users on WordPress functions.
An offline Bible-reading app for iPhone that lets readers explore connections between passages.
Teaches database design through interactive Postgres lessons and exercises graded with hidden tests.
Lets readers upload PDF and EPUB books to listen, ask questions, take notes, and sync progress across devices.
Teaches electronics by letting learners assemble devices from transistors and logic gates in a browser simulator.
A coding practice platform where users solve and visualize tree algorithm problems.
Lets people play, explore, and create piano chord progressions online, with guided keyboard playback and learning resources.
A platform for practicing React coding challenges with an in-browser editor and automated tests.
Maps users’ political views across 12 spectrums and compares their results with countries and ideologies.
Helps people practise typing by typing through articles they want to read.
Helps language learners practice listening with YouTube videos and subtitles that fade out as their level improves.
An interactive learning platform with lessons, labs, papers, and practice across software, AI, and other subjects.
A browser-based, no-code tool for building, simulating, and visualizing quantum circuits.
A research platform that helps researchers search and review papers, analyze data, and create academic materials.
A free interactive bird globe helps children explore, identify, and learn about bird species and their habitats.
A free mobile app that helps Muslims learn and memorize the Quran with recitation feedback, revision tests, and progress tracking.
Helps cryptic crossword solvers understand clues with step-by-step hints, daily puzzles, and guides.
Streams simulated satellite radio samples to help programmers learn digital signal processing without SDR hardware.
An interactive interface for writing and verifying Lean code locally while learning formal proofs.
Helps musicians practise reading sheet music by naming notes as a cursor moves across the score.
Trains chess players to spot attacks from both sides of the board.
A site for sharing and checking independent follow-on work on OpenAI math preprints.
Helps software engineers prepare for technical interviews with AI voice practice, coding questions, and spaced repetition.
An animated film and interactive playground that teach how TCP handles lost data.
Helps people understand topics and web pages through simple explanations, quizzes, and guided learning journeys.
An interactive simulation for comparing interstellar visitors’ paths with chance and possible probe trajectories.
Teaches programming through lessons and game-building projects for classic 8-bit and 16-bit systems.
A chapter-by-chapter guide for learning to build large language models from scratch with Node.js and TypeScript.
A digital museum presents historical subjects in 3D with labels distinguishing documented facts from reconstructions and conjecture.
An interactive 3D atlas for exploring the Solar System, stars, galaxies, and other astronomical objects.
A Chrome extension that highlights persuasion techniques in articles to help readers assess rhetoric.
Provides free browser-based classical cipher tools and guides for learners and people exploring cryptography.
Turns lecture notes and other study materials into source-checked quizzes for students to practice alone or with friends.
Helps educators find open-access AI teaching activities curated from nonprofit education providers.
A browser-based virtual guitar for playing songs, practicing chords, and learning strumming patterns.
Teaches college students digital logic through interactive lessons, instant-answer feedback, and exam-style practice.
Provides free public-domain sheet music and tempo-adjustable piano play-alongs for brass players.
A code review game where developers identify bugs and other issues in AI-written code snippets.
Helps software engineering candidates practice AI-assisted coding interviews using real codebases, an editor-based AI assistant, and staged tests.
Teaches Rust through personalized lessons, coding exercises, and spaced reviews for developers and beginners.
An open-source encyclopedia of interactive visualizations that users can explore and agents can edit through code.
Helps language learners build reading, listening, writing, and speaking skills with level-adaptive practice.
A mobile app for learning European Portuguese through offline lessons, audio exercises, pronunciation practice, and flashcards.