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Resources credits

Thank you to everyone who made these and shared them for free. Our copies are exactly as the makers published them, and each one is shared under the licence shown here.

Public domain means the work is free of copyright, so anyone can share it. Back to the Resources.

Coding and computer science

Electronics and physics

  • Lessons in Electric Circuits, Volume 1: DC

    Tony R. Kuphaldt. CC BY. Original: source.

  • Lessons in Electric Circuits, Volume 2: AC

    Tony R. Kuphaldt. CC BY. Original: source.

  • General Mechanics

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • Special Relativity

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • Acoustics

    Wikibooks contributors. CC BY 3.0. Original: source.

  • Basic Electricity (NAVPERS 10622, 1945)

    US Navy. Public domain. Original: source.

Maths

  • Siyavula Grade 10 Mathematics

    Free High School Science Texts. CC BY 3.0. Original: source.

  • Siyavula Grade 11 Mathematics

    Free High School Science Texts. CC BY 3.0. Original: source.

  • Siyavula Grade 12 Mathematics

    Free High School Science Texts. CC BY 3.0. Original: source.

  • Siyavula Grade 10 Physical Science

    Free High School Science Texts. CC BY 3.0. Original: source.

  • Siyavula Grade 12 Physical Science

    Free High School Science Texts. CC BY 3.0. Original: source.

  • Introductory Statistics (OpenStax)

    OpenStax. CC BY. Original: source.

  • Discrete Mathematics: An Open Introduction

    Oscar Levin. CC BY-SA 4.0. Original: source.

  • Calculus

    David Guichard. CC BY-NC-SA. Original: source.

  • The First Six Books of the Elements of Euclid

    John Casey, 1885. Public domain. Original: source.

  • Flatland

    Edwin A. Abbott, 1884. Public domain. Original: source.

  • Geometry for Elementary School

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • Trigonometry

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • Statistics

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • Calculus (Wikibooks)

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

Chemistry and biology

Earth and space

  • Wikijunior: Solar System

    Wikijunior contributors. CC BY-SA 3.0. Original: source.

  • Rockets Educator Guide

    NASA. Public domain. Original: source.

  • Exploring the Moon: A Teacher's Guide

    NASA. Public domain. Original: source.

  • Rocks and Minerals

    Wikibooks contributors. CC BY-SA 4.0. Original: source.

  • WikiReader: Decade Volcanoes

    Wikipedia contributors. CC BY-SA 3.0. Original: source.

Languages

  • FSI Cambodian (Khmer) Basic Course, Volume 1

    US Foreign Service Institute. Public domain. Original: source.

  • FSI Cambodian (Khmer) Basic Course, Volume 2

    US Foreign Service Institute. Public domain. Original: source.

  • FSI Spanish Basic Course, Volume 1

    US Foreign Service Institute. Public domain. Original: source.

  • FSI Spanish Basic Course, Volume 2

    US Foreign Service Institute. Public domain. Original: source.

  • FSI Spanish Basic Course, Volume 3

    US Foreign Service Institute. Public domain. Original: source.

  • FSI French Basic Course, Volume 1

    US Foreign Service Institute. Public domain. Original: source.

  • FSI French Basic Course, Volume 2

    US Foreign Service Institute. Public domain. Original: source.

  • FSI German Basic Course, Volume 1

    US Foreign Service Institute. Public domain. Original: source.

  • Spanish

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • German

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • Chinese (Mandarin)

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • Latin

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • Wikijunior: Languages

    Wikijunior contributors. CC BY-SA 3.0. Original: source.

Writing and storytelling

  • Rhetoric and Composition

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • The Elements of Style

    William Strunk Jr., 1920. Public domain. Original: source.

  • Treasure Island

    Robert Louis Stevenson, 1911. Public domain. Original: source.

  • The Jungle Book

    Rudyard Kipling, 1913. Public domain. Original: source.

  • Anne of Green Gables

    L. M. Montgomery, 1908. Public domain. Original: source.

  • The Wonderful Wizard of Oz

    L. Frank Baum, 1900. Public domain. Original: source.

  • The Baby's Own Aesop

    Walter Crane, 1908. Public domain. Original: source.

History, geography and civics

  • UK Constitution and Government

    Wikibooks contributors. CC BY-SA 3.0. Original: source.

  • Wikijunior: Kings and Queens of England

    Wikijunior contributors. CC BY-SA 3.0. Original: source.

  • World Regional Geography

    Caitlin Finlayson. CC BY-NC-SA. Original: source.

  • The Constitution of the United States of America

    US government. Public domain. Original: source.

  • Introduction to Intellectual Property

    OpenStax. CC BY 4.0. Original: source.

Economics and money

  • Principles of Macroeconomics for AP Courses

    OpenStax. CC BY 4.0. Original: source.

  • Principles of Microeconomics for AP Courses

    OpenStax. CC BY 4.0. Original: source.

  • Introductory Business Statistics

    OpenStax. CC BY 4.0. Original: source.

Philosophy and thinking

  • Introduction to Logic and Critical Thinking, v2.0

    Matthew Van Cleave. CC BY 4.0. Original: source.

  • Formal Logic

    Wikibooks contributors. CC BY-SA 4.0. Original: source.

  • The Problems of Philosophy

    Bertrand Russell, 1912. Public domain. Original: source.

  • Meditations

    Marcus Aurelius, translated by George Long, 1890. Public domain. Original: source.

Study skills and wellbeing

Making, art and music

Games and puzzles

Photography

Animated stickers

The stickers in private chats are Noto Emoji by Google, licensed CC BY 4.0. We resized and re-encoded them, and host them ourselves. Originals.