Alternatives to Mystery Twister C3

Khan Academy

Free, world-class education

Duolingo

The world's best way to learn a language

Anki

Flashcard app using spaced repetition

Coursera

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Scratch

Imagine, Program, Share

Codecademy

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Moodle

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WolframAlpha

Powerful computational knowledge engine

edX

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Kahoot!

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LearnHouse

Open Source Learning Platform

lernu!

A multilingual website for learning the international language Esperanto

Pasporta Servo

Hospitality service for esperantists

Project Euler

Project Euler features a stunning set of good math problems

TypeLit.io

Practice typing by retyping ENTIRE books

Autism Simulator

Workplace Experience Simulation

Future Learn

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Astronomy Picture of the Day

Website featuring daily astonomy images, provided by NASA and Michigan…

Busuu

Study a new language online with Busuu's award-winning courses

Desmos Graphing Calculator

Plot multiple 2D plots on same sheet, see graph intersections

Parsnip

Level up your cooking skills

Udemy

Online Courses for Skills, Careers & AI

Ameelio

Transforming corrections with technology

Cloudbite

Bite-sized cloud learning with spaced repetition

Futurecoder

100% free and interactive Python course for beginners

Glossarie

The new, immersive way to learn a language

Intuitive Math

Intuitive Math Descriptions

Mathcha

Online Math Editor

Pickcode

Teach computer science your way

Preply

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Spark Bible

Learn the Bible with video from top Bible teachers

CleverDeck

Spaced Repetition Flashcards for iPhone

CourseLit

An open-source platform for building and selling online courses

KanaDojo

Learn Japanese Hiragana, Katakana, Kanji & Vocabulary Online

Quickz

Quickz is the future of live quizzes

React-graph-gallery

Learn to build unique charts with React

C0D3

Learn Javascript the old school way

Codementor

Get live 1:1 coding help, hire a developer, & more

iorad

Drive Adoption with Interactive Tutorials

Patio

Tool Sharing, Tool Libraries & DIY Community

The Deadlock Empire

Slay dragons, learn concurrency

Turnitin

Internet-based plagiarism-prevention service

What The Flexbox?!

A simple 20 video course that will help you master CSS Flexbox

Whataaabout

Unique activity ideas for the holiday break

Free Professional Resume Templates & Editor

Journals, CVs, Presentations, Reports and More

Gridmaster

Learn Spreadsheets by Doing

italki.com

Explore language learning with italki

jsdares

Experimental educational programming environment

Pokémon RL

Learning Pokémon With Reinforcement Learning

React For Beginners

The best way to learn React