Good news, free textbooks that are written by knowledgeable scholars are here now. Below, you will find a list of 200 Free Textbooks and check back often for new additions. Also see our online collection, 100 Best Free Online Courses as well as 1,500 Free Online Courses from Top Universities.

Art History

A Textbook of the History of Painting by John Charles Van Dyke, Rutgers

Biology

Anatomy and Physiology – Edited by various profs at OpenStax
Biology – Edited by various profs at OpenStax
Biology Pages, John W. Kimball, Harvard University
Biochemistry Free and Easy – Kevin Ahern and Dr. Indira Rajagopal, Oregon State
Botany Online: The Internet Hypertextbook by multiple scholars.
Cells: Molecules and Mechanisms. Published by the Axolotl Academic Publishing Co.
CK-12 Biology I (Grades 9-12) edited by Douglas Wilkin, Chair, Dept of Science, Los Angeles Unified School District
CK-12 Life Science (Grades 9-12) edited by Douglas Wilkin, Chair, Dept of Science, Los Angeles Unified School District
Concepts of Biology – Edited by various profs at OpenStax
Guide to Getting into Med School – Kevin Ahern and Dr. Indira Rajagopal, Oregon State
Life on Earth (iBook) – E.O. Wilson, Harvard
Rediscovering Biology by multiple authors, UMass Amherst, University of Missouri-St. Louis, Portland Community College

Business and Management

Business Ethics by Jose A. Cruz-Cruz, William Frey, University of Puerto Rico – Mayaguez
Business Fundamentals by the Global Text Project
Core Concepts of Marketing by John Burnett
Corporate Finance by Ivo Welch, UCLA
CREATE OR PERISH: The Case for Inventions and Patents by Robert Rines, MIT
Electronic Commerce by Multiple authors, University of Georgia, Bentley College, and Simon Fraser University

Guidelines for Improving the Effectiveness of Boards of Directors of Nonprofit Organizations by Vic Murray and Yvonne Harrison, SUNY, Albany

Chemistry

Chemistry, Grades 10-12, Created by the FHSST Project (Free High School Science Texts)
Chemistry Virtual Textbooks by Stephen Lower, Simon Fraser University
CK-12 Chemistry (Grades 9-12) by multiple authors. Covers high school chemistry curriculum in California.
Concept Development Studies in Chemistry by John S. Hutchinson, Rice University
Organic Chemistry (with a Biological Emphasis) by Tim Soderberg, University of Minnesota, Morris
Virtual Textbook of Organic Chemistry. Presented by Michigan State

Classics

Cicero, On Pompey’s Command (De Imperio), 27–49. Latin Text, Study Aids with Vocabulary, Commentary, and Translation, by Ingo Gildenhard, Louise Hodgson, et al, Cambridge University.
Tacitus, Annals, 15.20-23, 33-45. Latin Text, Study Aids with Vocabulary, and Commentary, by Mathew Owen and Ingo Gildenhard, Cambridge University
Virgil, Aeneid, 4.1–299. Latin Text, Study Questions, Commentary and Interpretative Essays by Ingo Gildenhard, by Cambridge University
Cicero, Against Verres, 2.1.53–86. Latin Text with Introduction, Study Questions, Commentary and English Translation, by Ingo Gildenhard, Cambridge University

Computer Science & Information Systems

A Byte of Python, by Swaroop C H
A First Course in Electrical and Computer Engineering by Louis Scharf, Colorado State
Artificial Intelligence: Foundations of Computational Agents by David Poole and Alan Mackworth, University of British Columbia
Bits, Signals, and Packets: An Introduction to Digital Communications and Networks by Hari Balakrishnan, Christopher Terman, and George Verghese, MIT
Code Like a Pythonista: Idiomatic Python, by David Goodger
Computational Geometry by Nicholas M. Patrikalakis, Takashi Maekawa, MIT
Dive into Python, by Mark Pilgrim
Foundations of Computer Science by Al Aho (Columbia) and Jeff Ullman (Stanford)
How to Design Programs: An Introduction to Computing and Programming, Multiple Authors
High Performance Computing by Charles Severance, University of Michigan
How to Think Like a Computer Scientist: C ++ ( PDF) by Allen B. Downey, Olin College
How to Think Like a Computer Scientist: Java by Allen B. Downey, Olin College
How to Think Like a Computer Scientist: Python by Allen B. Downey, Olin College
How to Think Like a Computer Scientist: Learning with Python 3 by Peter Wentworth, Jeffrey Elkner, Allen B. Downey, and Chris Meyers.
Implementing a One Address CPU in Logisim by Charles W. Kann III, Gettysburg College
Information Technology and the Networked Economy by Patrick McKeown, University of Georgia
Information Technology for Management by Henry Lucas, NYU
Information Theory, Inference, and Learning Algorithms by David MacKay, Cambridge
Introduction To MIPS Assembly Language Programming by Charles W. Kann III, Gettysburg College
iPad and iPhone App Development (related to this video course) by Daniel Steinberg, Stanford
Learn Python the Hard Way, by Zed A. Shaw
Neural Networks and Deep Learning, by Michael Nielsen, Research Fellow at the Recurse Center
Philosophy of Computer Science by William J. Rapaport, University at Buffalo, The State University of New York
Principles of Computer System Design: An Introduction (Part II) by Jerome Saltzer and M. Frans Kaashoek.
Principles of Programming Languages by Grad Students, Johns Hopkins
Programming Languages: Application and Interpretation by Dr. Shriram Krishnamurthi, Brown University.
Prolog and Natural-Language Analysis by Fernando C. N. Pereira and Stuart M. Shieber, U Penn & Harvard
Python for Informatics: Exploring Information by Charles Severance, University of Michigan
Structure and Interpretation of Computer Programs by Jerry Sussman & Julie Sussman
Teach Yourself WordPerfect Mac by John Rethorst
The Princeton Bitcoin Textbook by Arvind Narayanan (Princeton) and colleagues

Earth Science

CK-12 Earth Science for Middle School by multiple authors.
Earth Systems, an Earth Science Course (Grades 9-10). Published by Curriki. Covers California curriculum.
Introduction to Physical Oceanography by Dr. Robert Stewart, Texas A&M University

Economics & Finance

Principles of Macroeconomics by Libby Rittenberg and Timothy Tregarthen, Colorado College

Education

Educational Psychology by Kevin Seifert and Rosemary Sutton, University of Manitoba and Cleveland State

Electrical Engineering

Digital Circuit Projects: An Overview of Digital Circuits Through Implementing Integrated Circuits by Charles W. Kann, Gettysburg College
Electromagnetics and Applications by David Staelin, MIT
Electromechanical Dynamics by Herbert H. Woodson and James R. Melcher, MIT
Fundamentals of Electrical Engineering I by Don Johnson, Rice University
Introduction to Nanoelectronics by Marc Baldo, MIT
Introduction to Physical Electronics by William Wilson, Rice University
Introduction to Statics and Dynamics by Andy Ruina and Rudra Pratap, Cornell University
Lessons In Electric Circuits by Tony R. Kuphaldt, Bellingham Technical College
Operational Amplifiers: Theory and Practice by James K. Roberge, MIT
Signals, Systems and Inference by MIT
Signals and Systems, by Alan Oppenheim and Alan Willsky, MIT
System Design for Uncertainty, by Michael S. Triantafyllou, MIT
The Art of Insight in Science and Engineering: Mastering Complexity, by Prof. Sanjoy Mahajan

Engineering

Analysis of Structural Member Systems by Jerome Connor, MIT
Engineering: An Introduction for High School (9-12) by multiple authors
Maneuvering and Control of Surface and Underwater Vehicles, by Michael S. Triantafyllou, MIT
Mechanics of Materials by MIT

History

US History Learner English (ESL) by The Learner English Series
U.S. History since 1877 by James Ross-Nazzal, Houston Community College

Languages

Deutsch im Blick by the University of Texas
German for Reading Knowledge by Howard Martin, revised and expanded as an open online textbook by Alan Ng, University of Wisconsin-Madison
Hindi: An Active Introduction by DN Sharma & James Stone, Foreign Service Institute
Learning Chinese: A Foundation Course in Mandarin (Part 1). by Julian Wheatley, MIT
My Korean 1 and 2 by Young-A Cho, In-Jung Cho, Monash University (Australia)
Español I (free for iPad) by David Nance, ADE Distance Learning Center
French: Familiarization and Short-Term Training by Foreign Service Institute
Spanish: Familiarization and Short Term Training by Foreign Service Institute

Law

Intellectual Property: Law & the Information Society—Cases and Materials by James Boyle and Jennifer Jenkins, Duke

Linguistics

How Language Works: The Cognitive Science of Linguistics by Mike Gasser, Indiana University

Mathematics

Abstract Algebra: The Basic Graduate Year by Robert B. Ash, University of Illinois
Abstract Algebra: Theory and Applications by Thomas W. Judson, Stephen F. Austin State University
Advanced Algebra II by Kenny Felder, Raleigh Charter High School
Advanced Calculus by Sternberg Shlomo and Lynn Loomis, Harvard University
Algebra 1 (Grades 9 & 10) by Andrew and Anne Gloag, High Tech High in San Diego, California
Algebra and Analysis for Computer Science by Jean Gallier, University of Pennsylvania.
Applied Probability by Paul Pfeiffer, Rice University
Basic Analysis by Jiří Lebl, University of Illinois at Urbana-Champaign
Basic Concepts of Mathematics by Elias Zakon, The University of Windsor
Basic Probability Theory by Robert B. Ash, University of Illinois
Basic Probability and Statistics by Brenda Meery, high school mathematics teacher in Glace Bay, Nova Scotia
Book of Proof by Dr. Richard Hammack, Virginia Commonwealth University
Calculus for Beginners and Artists by MIT
Calculus Online Textbook, by Gilbert Strang, MIT
Calculus (PDF) by David Guichard, Whitman College.
Calculus (PDF) by Gilbert Strang, MIT
Calculus 1 by Paul Dawkins, Lamar University
Calculus 2 by Paul Dawkins, Lamar University
Calculus 3 by Paul Dawkins, Lamar University
Calculus with Applications, by Daniel Kleitman, MIT
CK-12 Geometry (Grades 10-12) by multiple authors. Covers California curriculum.
CK-12 Single Variable Calculus (Grades 11-12) by Multiple authors. Covers California curriculum.
CK-12 Trigonometry – Second Edition (Grades 10-12) by multiple authors. Covers California curriculum.
Collaborative Statistics by Barbara Illowsky, Ph.D and Susan Dean, De Anza College
College Algebra by Paul Dawkins, Lamar University
Complex Analysis by George Cain, Georgia Institute of Technology
Complex Variables by Robert B. Ash, University of Illinois
Computational Geometry by Nicholas M. Patrikalakis, Takashi Maekawa, MIT
A Computational Introduction to Number Theory and Algebra by Victor Shoup, NYU
A Course In Algebraic Number Theory by Robert B. Ash, University of Illinois
A Course In Commutative Algebra by Robert B. Ash, University of Illinois
Design of Comparative Experiments by R. A. Bailey, University of London
Difference Equations to Differential Equations: An Introduction to Calculus by Dan Sloughter, Furman University
Differential Equations by Paul Dawkins, Lamar University
Discrete Mathematics: An Open Introduction by Oscar Levin, University of Northern Colorado
Dynamical Systems by S. Sternberg, Harvard University
Electronic Statistics Textbook by T. Hill & P. Lewicki.
Elementary Abstract Algebra by W. Edwin Clark, University of Southern Florida
Elementary Calculus: An Infinitesimal Approach by H. Jerome Keisler, University of Wisconsin-Madison
Elementary Differential Equations (PDF) by William F. Trench, Trinity University
Elementary Differential Equations with Boundary Value Problems (PDF) by William F. Trench, Trinity University
Student Solutions Manual for Elementary Differential Equations and Elementary Differential Equations with Boundary Value Problems (PDF) by William F. Trench, Trinity University
Elementary Linear Algebra by Keith Matthews, University of Queensland
Elementary Number Theory by W. Edwin Clark, University of Southern Florida
Elements of Abstract and Linear Algebra by Edwin H. Connell, University of Miami
First Course in Complex Analysis by Matthias Beck, Gerald Marchesi, and Dennis Pixton, SUNY – Binghamton
First Course in Linear Algebra by Dr. Robert Beezer, University of Puget Sound
Functions Defined by Improper Integrals (PDF) by William F. Trench, Trinity University
GeneratingFunctionology by Herbert Wilf, University of Pennsylvania
Introduction to Matrix Algebra by Autar K Kaw, University of South Florida
Introduction to Probability (PDF) by Charles Grinstead & J. Laurie Snell, Swarthmore & Dartmouth Colleges
Introduction to Probability, Statistics, and Random Processes by Hossein Pishro-Nik, UMass Amherst
Introduction to Real Analysis (PDF) by William F. Trench, Trinity University
Introduction to Social Network Methods by Robert A. Hanneman and Mark Riddle, UC Riverside
Introduction to Statistical Thought by Michael Lavine, UMASS
Introductory Statistics: Concepts, Models, and Applications by David W. Stockburger, Missouri State
Introduction to the Theory of Numbers by Leo Moser, McGill
Lectures on Probability, Statistics and Econometrics by Marco Taboga, Economist, Bank of Italy
Lectures on Statistics by Robert B. Ash, University of Illinois
Linear Algebra (PDF) by Jim Hefferon, Saint Michael’s College
Linear Algebra by Paul Dawkins, Lamar University
Math Alive by Ingrid Daubechies, Princeton University
Math in Society by David Lipmann, Pierce College
Math, Numerics, and Programming (for Mechanical Engineers) by Masayuki Yano, MIT
Mathematical Methods of Engineering Analysis (PDF) by Erhan Çinlar and Robert J. Vanderbei, Princeton University
Multivariable Calculus by George Cain & James Herod, Georgia Tech
Proofs and Concepts: The Fundamentals of Abstract Mathematics by Dave Witte Morris and Joy Morris, University of Lethbridge
Real Variables with Basic Metric Space Topology by Robert B. Ash, University of Illinois
Statistics by Philip B. Stark, University of California – UC Berkeley
A Summary of Calculus by Karl Heinz Dovermann, University of Hawaii
The Book “A=B” by Marko Petkovsek, Herbert Wilf and Doron Zeilberger, Univ. of Pennsylvania and Rutgers
The Method of Lagrange Multipliers (PDF) by William Trench, Trinity University
The Calculus of Functions of Several Variables by Dan Sloughter, Furman University
Yet Another Calculus Text by Dan Sloughter, Furman University

Music

Beyond Slonimsky: Melodic Patterns for Guitar – by Rich Cochrane (Find alternate version here)
Music Fundamentals 1: Pitch and Major Scales and Keys – by Terry B. Ewell, Towson University
Music Fundamentals 3: Minor Scales and Keys – by Terry B. Ewell, Towson University
Music Fundamentals 5: Triads, Chords, Introduction to Roman Numerals by Terry B. Ewell, Towson University
Scale and Arpeggio Resources: A Guitar Encyclopedia by Rich Cochrane (Find alternate version here)
Sound Reasoning (Introductory Music course) by Anthony Brandt, Rice University
Understanding Basic Music Theory, Edited by Catherine Schmidt-Jones

Philosophy

Animals and Ethics 101: Thinking Critically About Animal Rights by Nathan Nobis, Morehouse College
A Modern Formal Logic Primer by Paul Teller, UC Davis
Arguments: Deductive Logic Exercises, by H. Pospesel and D. Marans, UC Davis
forall x: An Introduction to Formal Logic by PD Magnus, University at Albany, State University of New York
forallx: Cambridge by P.D. Magnus; modified for Cambridge by Tim Button
Metatheory for truth-functional logic by Tim Button, Cambridge University

Physics

Age of Einstein, by Frank W. K. Firk, Yale University.
Calculus-Based Physics by Jeffrey W. Schnick, Saint Anselm College
Classical Electrodynamics by Bo Thidé, Uppsala School of Engineering
College Physics (introductory, algebra-based, two-semester college physics book) by OpenStax
Conceptual Physics by Benjamin Crowell, Fullerton College
Conservation Laws by Benjamin Crowell, Fullerton College
Essential Physics 1, Frank W.K. Firk, Yale University
Fields by Warren Siegel, SUNY
General Relativity by Benjamin Crowell, Fullerton College
Introduction to Groups, Invariants & Particles, by Frank W. K. Firk, Yale University
Introduction to Statics and Dynamics by Andy Ruina and Rudra Pratap, Cornell University
Introduction to String Field Theory by Warren Siegel, SUNY
Mountain Motion (or on Scribd) by Dr. Christoph Schiller PhD, trained at Université Libre de Bruxelles
Optics by Benjamin Crowell, Fullerton College
Principles of Modern Physics – Robert B. Leighton, Caltech
Programming Languages: Application and Interpretation by Dr. Shriram Krishnamurthi, Brown University
Simple Nature: An Introduction to Physics for Engineering and Physical Science Students by Ben Crowell, Fullerton College
Superspace: One Thousand and One Lessons in Supersymmetry by Warren Siegel. Jim Gates, Marc Grisaru, and Martin Rocek, SUNY, McGill, University of Maryland
The Feynman Lectures on Physics by Richard Feynman, Robert B. Leighton and Matthew Sands
The Light and Matter Series (Six texts) by Benjamin Crowell, Fullerton College
Vibrations and Waves by Benjamin Crowell, Fullerton College
The Modern Revolution in Physics by Benjamin Crowell, Fullerton College
The People’s Physics Book by James H. Dann, UC Santa Cruz
21st Century Physics Flexbook: A Compilation of Contemporary and Emerging Technologies, by the Secretaries of Education and Technology and the Department of Education in the state of Virginia