Categories
A community-editable language-learning app with personalized lessons and spaced-repetition reviews.
A local desktop app for creating structured language courses and studying them offline.
Hosts mathematical competitions where participants solve unsolved problems.
Analyzes news articles and videos with summaries, rhetorical-technique labels, historical context, and claim checks.
Provides interactive, browser-based machine-learning lessons for learners and schools.
Creates personalized three-minute lessons with videos, audio, reading, spaced repetition, and an AI tutor.
A browser-based CPU simulator that helps learners explore assembly language and computer architecture interactively.
Teaches distributed systems concepts through short comics that address common misconceptions.
A free browser game that teaches beginners and challenges experienced coders with JavaScript and Python puzzles.
Gives children a parent-curated shelf of approved YouTube videos without search or algorithmic feeds.
A guitar-learning app that provides real-time feedback and personalized practice for players of all levels.
An interactive browser-based course teaches backend engineers systems programming for large-scale LLM serving.
Teaches trading through free guides, chart and options drills, and coached simulated trades.
Simulates the 2026 solar eclipse in 3D for any location, showing local timing, obscuration, and viewing conditions.
Compares Wikipedia articles across languages to highlight differences in framing and content for critical readers.
Helps learners practice everyday spoken Telugu through story-based lessons, spaced phrase review, audio, and games.
Organizes downloaded course videos into structured lessons with progress tracking for offline learners.
A Chrome extension that translates X and Reddit posts and messages, then turns vocabulary into learning challenges for English learners.
A searchable library of psychedelic and consciousness research for readers and researchers.
Generates violin fingering recommendations from sheet music for students and performers.
A free visual learning platform that teaches backend engineering and system design through guides, interactive explainers, and tools.
Helps pianists learn and memorize sheet music by tracking MIDI performances and scheduling bar-by-bar reviews.
Provides interactive step-by-step drawing lessons and feedback for people learning to draw.
A story-based game teaches software engineers system design through interactive infrastructure challenges.
Publishes illustrated science articles and at-home experiments for curious young readers.
Provides eclipse times, maps, and an interactive 3D viewing simulation for the 2026 solar eclipse.
Provides personalized math practice and progress tracking for students in grades 2 - 12, with evidence of their work for parents.
Generates printable maths and computational-thinking puzzle worksheets for children, with shareable links.
Provides free web development courses with lessons, exercises, and progress tracking for learners from beginner to full-stack.
Provides hands-on Linux and infrastructure courses in isolated machines for engineers to practice diagnosing and repairing systems.
Provides guided machine-learning study sessions and tools for creating interactive technical explanations.
Creates imaginary scientific concepts and explains them in kid-friendly language using an AI model in the browser.
Helps IELTS learners practice essays with instant AI scoring, rubric feedback, annotations, and rewrite suggestions.
An interactive adventure teaches people to work with Claude using prompts, skills, and autonomous agents.
Helps students and teachers track and review the process behind coursework writing, including edits, pastes, and AI use.
A self-hosted AI learning platform where agents teach, quiz, and certify learners.
A Windows and Mac tutor that guides people through tasks inside the apps they use.
Helps students study by using a device camera to coach them through textbook and worksheet problems.
Verifies citations in academic PDFs for researchers, students, and academics using AI extraction and database checks.
A library of educational simulation games where players learn by building and track progress across games.
An iPhone app turns books you've read into flashcards and uses spaced repetition to help readers remember their ideas.
A language-learning workspace for reading leveled texts, writing essays with AI feedback, and practicing vocabulary.
An offline ebook format that helps language learners understand words through aligned sentence translations.
Turns YouTube playlists into distraction-free courses with progress tracking and an optional browser extension.
A geography guessing game that challenges players to name highlighted countries or territories.
Helps parents and teachers assess children’s reading aloud and guide targeted practice.
A browser game for practicing arithmetic by solving problems and timing jumps while running.
Turns lecture notes or YouTube transcripts into quizzes and flashcards for students to study.
Provides step-by-step drawing tutorials for people practicing illustration with pencils and markers.
An interactive game that teaches computer architecture by building logic gates, circuits, CPUs, and programs.
Helps readers ask about terms in a book and hear answers without losing their place.
Helps college applicants review personal statements, generate sample essays, and learn from successful applications.
A reading site for the Federalist Papers with modern reading views, companion notes, and optional postal subscriptions.
Teaches Vim through interactive browser-based editing levels for people learning the editor.
An interactive learning experience that uses NBA results and judgment tests to explore how recent outcomes shape expectations.
An interactive map lets people explore nuclear detonations from 1945 to 2017.
A searchable database for tracing English word origins, historical forms, and related words.
Provides hands-on prompt injection and AI security labs for learners and security professionals.
A step-by-step tutorial for developers building a fire effect with Three.js and GLSL shaders.
A browser and extension that blocks ads and replaces them with vocabulary prompts for language learners and word enthusiasts.
An annotated edition of The Great Gatsby explains its references to esoteric traditions.
Provides free, offline spaced-repetition flashcards for DevOps, cloud, and certification learners, with no account required.
A cross-platform keyboard for typing International Phonetic Alphabet symbols in any app.
An interactive reference for exploring over 100 theories of how society works.
A mobile card game that teaches financial decisions through AI-generated scenarios and advisor commentary.
A web-based simulator visualizing charge-carrier motion and currents in transistor devices.
Teaches chess openings through interactive lessons and AI coaching.
Offers short, 3Blue1Brown-style video explainers that help viewers understand recent research papers.
A simplified black hole visualization for exploring what one looks like.
Helps prospective researchers find and compare principal investigators using profiles built from public scholarly data.
A free browser-based 3D universe explorer for exploring planets, space missions, and stellar objects.
A free book and interactive companion that help readers refresh mathematics from arithmetic through machine learning concepts.
Turns notes from reading into flashcards for users to review through AI assistants and connected apps.
A timed subnetting game that helps network engineers and students practice CIDR calculations.
Helps developers practice technical questions, prepare for interviews, and track progress across skills.
Helps Spanish learners practice vocabulary through a Scrabble-style game against an AI opponent.
Turns educational videos into interactive courses with AI-generated questions, progress tracking, and targeted rewinds.
An interactive learning resource showing before-and-after examples of 21 UX design principles.
Creates personalized study plans, quizzes, and spaced-repetition reviews from learners’ own materials.
A Chrome extension that tracks homework pace and offers step-by-step help and study materials for students.
An interactive map for exploring cultural artifact provenance by place, time, and collection.
A free typing game with daily challenges, personal bests, and leaderboards for players practicing typing speed.
Helps learners retain knowledge with interactive lessons, learning paths, and spaced-repetition flashcards.
A cited archive of Apollo 11’s lunar-surface mission for readers exploring its history and science.
A searchable, citable repository that helps builders and researchers find unresolved problems to work on.
Teaches developers to understand codebases through guided coding lessons without writing code for them.
A browser puzzle game that teaches AVL trees and data structures by guiding squirrels through tree rotations.
Teaches PostgreSQL through browser-based exercises graded by a real Postgres engine.
Helps job seekers practise interview answers aloud and get feedback tailored to the job they are applying for.
Turns lecture recordings into organized study books with chapters, figures, notes, bookmarks, and study tools.
A gamified learning RPG for exploring Ilya Sutskever’s work.