ACT
Free ACT practice tests and prep
Official free ACT practice tests, sample questions, and study guides.
Access / license: Official free practice
Used in
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Source citations
Curriculum source library
Every external source cited in the PeerTutor curriculum maps, with the access label and the subjects that reference it.
Citation policy
PeerTutor publishes original curriculum maps and links out to source materials. Open-license OER can be reused under its own license; Khan Academy, CK-12, Organic Chemistry Tutor, College Board, ACT, and ETS are linked as free or official resources, not copied into PeerTutor.
Open source
CK-12 Foundation
FlexBook textbooks and concepts
STEM FlexBooks, bite-size concepts, practice, and standards-aligned textbook paths; linked rather than republished.
Access / license: Free educational link-out - CK-12 terms
College Board
AP Computer Science Principles
Official AP CSP course overview, framework, and exam information.
Access / license: Official free practice
College Board
SAT practice
Official Bluebook practice tests, question bank, and SAT study guidance.
Access / license: Official free practice
Used in
ETS
GRE practice
Official GRE practice tests, sample questions, and prep materials.
Access / license: Official free practice
Used in
FSI Language Courses
FSI French courses
French audio and text courses based on U.S. government FSI materials.
Access / license: Public-domain language course archive
Used in
FSI Language Courses
FSI Spanish courses
Spanish audio and text courses based on U.S. government FSI materials.
Access / license: Public-domain language course archive
Used in
FSI Language Courses
FSI Standard Chinese
Chinese course materials and audio from the FSI archive.
Access / license: Public-domain language course archive
Used in
ISKME
OER Commons
Searchable library of open educational resources across K-12 and higher education.
Access / license: OER discovery library
Khan Academy
Algebra
Free practice and videos; linked only because Khan content is not open-source.
Access / license: Free link-out - Khan Academy terms
Used in
Khan Academy
AP/College Biology
Free AP Biology video and mastery path; linked as a companion course.
Access / license: Free link-out - Khan Academy terms
Used in
Khan Academy
AP/College Calculus AB
Free AP Calculus AB video and mastery path; linked as a companion course.
Access / license: Free link-out - Khan Academy terms
Used in
Khan Academy
AP/College Chemistry
Free AP-modeled practice path; link-out only.
Access / license: Free link-out - Khan Academy terms
Used in
Khan Academy
AP/College Computer Science Principles
Free AP CSP video and mastery path; linked as a companion course.
Access / license: Free link-out - Khan Academy terms
Khan Academy
AP/College Physics 1
Free AP Physics 1 video and mastery path; linked as a companion course.
Access / license: Free link-out - Khan Academy terms
Used in
Khan Academy
AP/College Statistics
Free AP Statistics video and mastery path; linked as a companion course.
Access / license: Free link-out - Khan Academy terms
Used in
Khan Academy
Economics and finance
Free economics, finance, AP microeconomics, and AP macroeconomics practice.
Access / license: Free link-out - Khan Academy terms
Used in
Khan Academy
Official Digital SAT Prep
Free official SAT preparation in partnership with College Board.
Access / license: Official free practice
Used in
Khan Academy
Organic chemistry
Free organic chemistry course path; link-out only.
Access / license: Free link-out - Khan Academy terms
Used in
MDN Web Docs
JavaScript Guide
Open web documentation for JavaScript fundamentals and browser APIs.
Access / license: Open reference
Used in
MIT OpenCourseWare
6.0001 Introduction to Computer Science and Programming in Python
Introductory Python course with lectures, notes, and problem sets.
Access / license: Open courseware - Creative Commons
MIT OpenCourseWare
6.0002 Introduction to Computational Thinking and Data Science
Python-based modeling, simulation, optimization, and data analysis course.
Access / license: Open courseware - Creative Commons
Used in
MIT OpenCourseWare
Introductory science and math courses
College-level calculus, physics, chemistry, biology, and related introductory material.
Access / license: Open courseware - Creative Commons
Open Music Theory
Open Music Theory
Open music theory textbook for notation, harmony, analysis, and musicianship.
Access / license: Open textbook - Creative Commons
OpenDSA
OpenDSA eTextbooks
Data structures and algorithms materials with visualizations and interactive exercises.
Access / license: Open-source CS courseware
Used in
OpenStax
Algebra curriculum
High school algebra curriculum and supporting textbooks.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
Biology for AP Courses
AP-modeled biology text with college-level depth.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
Calculus textbooks
Three-volume calculus sequence covering single- and multivariable calculus.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
Chemistry 2e
General chemistry textbook for a full high school honors, AP-modeled, or college sequence.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
College Physics for AP Courses 2e
Algebra-based physics text aligned to AP-style physics coverage.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
OpenStax Math
Free math textbooks including Algebra 1, Calculus, Statistics, and Principles of Data Science.
Access / license: Open textbook - CC BY-NC-SA 4.0
OpenStax
OpenStax Science
Free science textbooks for biology, chemistry, physics, anatomy, astronomy, and more.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
Organic Chemistry
Open organic chemistry text for structure, reactions, mechanisms, and spectroscopy.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
Principles of Accounting
Financial accounting foundation with managerial accounting extension.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
Principles of Data Science
Data science cycle, Python, statistics, modeling, visualization, and ethics.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
Principles of Economics 3e
Introductory microeconomics and macroeconomics sequence.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
Psychology 2e
Introductory psychology text covering research, biology, cognition, development, and disorders.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
U.S. History
Survey text with primary-source features and historical inquiry questions.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
OpenStax
Writing Guide with Handbook
Composition, research, rhetorical analysis, and grammar reference.
Access / license: Open textbook - CC BY-NC-SA 4.0
Used in
Project Gutenberg
Project Gutenberg
Classic literature collection focused on works no longer restricted by U.S. copyright.
Access / license: Public-domain literature archive
Used in
Runestone Academy
Foundations of Python Programming
Interactive Python textbook with active code, tracing, and chapter assessments.
Access / license: Open interactive textbook
The Organic Chemistry Tutor
Organic Chemistry Tutor videos
Useful worked-example videos; not open-source, so it is linked rather than republished.
Access / license: Free video link-out
Used in
UC Berkeley / John DeNero
Composing Programs
Python-based computer science text adapted from CS 61A and SICP ideas.
Access / license: Open textbook - CC BY-SA 3.0