Save $1,000+ This Semester: The 7 Best Open Educational Resources for Free Textbooks & Course Materials

I still remember the semester I spent $487 on a single chemistry textbook—and then opened the shrink-wrap to find the professor had posted the same edition as a free PDF on the course site. That moment, sitting in my dorm with the receipt still warm in my hand, I decided I would never, ever buy another full-price textbook without checking the alternatives first. Over the next two years, I swapped out every major textbook for an open educational resource—and saved roughly $1,300 per semester. You can do the same. Here's exactly how.

Why Open Educational Resources Are a Game-Changer for Your Wallet

The College Board reported that the average undergraduate in the U.S. spent about $1,240 on books and supplies during the 2023–2024 academic year. That's more than the cost of some tuition bills at community colleges. And for students in science, technology, engineering, and math (STEM) fields, the tab can easily hit $2,000. Open educational resources (OER) flip that script entirely. They're free, openly licensed textbooks, videos, quizzes, and full courses that you can download, print, or view online—legally, forever. No rental fees, no access codes that expire after a semester.

When I first stumbled onto OER, I was skeptical. “Free” usually means “low quality” or “discontinued after chapter 3.” But what I found surprised me. Platforms like OpenStax, run by Rice University, produce peer-reviewed textbooks that match the rigor of any $200 commercial book. The key difference? The publisher doesn't charge you because the cost is covered by grants and institutional subscriptions. For the student, it's zero dollars.

Now, I'm not saying you can replace every single book with an OER—some niche upper-level courses still lack good open alternatives. But for the vast majority of general education requirements, introductory courses, and even many intermediate classes, OER is a proven, high-quality option. And the savings add up fast. Replace just two $200 textbooks with free OER, and you've already saved $400. Do that for three semesters, and you've pocketed more than $1,000.

The 7 Best Open Educational Resources for Free Textbooks and Course Materials

After personally testing more than a dozen OER platforms across subjects from calculus to art history, here are the seven that consistently deliver quality, usability, and real savings. I've ranked them by how often they cover common college courses, not by popularity.

1. OpenStax

Best for: Introductory STEM, economics, and social sciences.
What it offers: Peer-reviewed, openly licensed textbooks in physics, chemistry, biology, calculus, statistics, psychology, sociology, economics, and more. Each book is available as a free PDF, an online web view, or a low-cost print copy (around $30).
Why I like it: The books are written by subject-matter experts and updated regularly. I used the OpenStax Calculus Volume 1 for my first-year math class, and it was every bit as clear as the Stewart textbook my roommate paid $150 for—and it had practice problems with full solutions.

2. OER Commons

Best for: Finding materials across all disciplines, including humanities and arts.
What it offers: A massive digital library of open textbooks, lesson plans, quizzes, and full courses, all searchable by subject, education level, and material type.
Why I like it: This is the Google of OER. I once needed a module on Renaissance painting for an art history assignment, and OER Commons returned a curated collection from the Metropolitan Museum of Art—complete with high-resolution images and discussion questions.

3. Open Textbook Library

Best for: Upper-level and specialized courses in business, education, and social sciences.
What it offers: Over 1,200 free, openly licensed textbooks, many of which have been reviewed by faculty from major universities.
Why I like it: The peer review tag gives me confidence that the content isn't just thrown together. I used their Organizational Behavior book for a management class, and it covered exactly the same topics as the $180 textbook the professor originally assigned.

4. MERLOT

Best for: Supplementary materials—videos, simulations, animations, and interactive tutorials.
What it offers: A curated collection of free online learning materials, each peer-reviewed and tagged with a quality rating.
Why I like it: When I struggled with complex chemistry mechanisms, MERLOT's collection of molecular simulations let me rotate 3D molecules and watch reactions step by step. That interactive layer made the difference between a C and a B on my final.

5. BCcampus OpenEd

Best for: Canadian students or anyone looking for adaptable, modular textbooks.
What it offers: A curated collection of open textbooks, many of which are adaptations of existing OER for the Canadian curriculum.
Why I like it: The textbooks are designed to be remixed—you can take chapters from different books and combine them, as long as you follow the license. I once built a custom study guide by pulling three chapters from a BCcampus book and two from OpenStax.

6. LibreTexts

Best for: STEM, especially chemistry, biology, and engineering.
What it offers: A free, online platform that hosts and curates open textbooks, homework platforms, and interactive simulations.
Why I like it: It's like a Wikipedia for textbooks—anyone can contribute, but the content is vetted by a team of scientists. I used LibreTexts for organic chemistry, and the built-in practice problems with instant feedback saved me hours of flipping to an answer key.

7. MIT OpenCourseWare

Best for: Full course materials from a top-tier university—syllabi, lecture notes, assignments, and exams.
What it offers: Free, online publication of virtually all MIT course content, covering more than 2,500 courses across all disciplines.
Why I like it: You don't get credit, but you get the same lecture notes that MIT students see. When I needed to understand a tricky concept in linear algebra, I watched the MIT professor's video lecture and read his handwritten notes—free, and better than any tutoring session I could afford.

One trade-off I've learned: not every OER is perfect for every learning style. OpenStax books are thorough but text-heavy; MERLOT shines for visual learners. My advice: try two or three platforms for the same subject and see which one clicks. The free part means you can afford to be picky.

How to Find the Right OER for Your Courses: Tips That Actually Work

Knowing the platforms is half the battle. The other half is actually finding the OER that matches your course syllabus. Here's what I've learned from doing this for three years.

Start with your syllabus. Most professors list the required textbook's author, edition, and ISBN. Copy that information and paste it into the search bar of OER Commons or the Open Textbook Library. Many OER have been created specifically to replace popular commercial textbooks, so you might find a direct match. For example, if your syllabus lists Campbell Biology, OpenStax's Biology 2e covers nearly identical topics.

Check the license before you rely on it. Not all free resources are OER. A PDF found on a random website might be illegally uploaded. Legitimate OER will have a Creative Commons license—look for terms like “CC BY” or “CC BY-SA” that explicitly allow you to download, share, and sometimes modify the material. If you don't see a license, assume it's not OER and find another source.

Ask your professor or librarian. This is the single most effective shortcut. Many professors already know about OER and will tell you which one they recommend—or even better, they might adopt an OER for the whole class. I once emailed my geology professor asking if he'd consider an OpenStax alternative, and he switched the entire course to the free book the next semester. It never hurts to ask.

Use peer reviews. The Open Textbook Library and MERLOT both include faculty reviews that rate accuracy, clarity, and usability. Before you commit to a 500-page OER, read a couple of reviews to make sure it's not outdated or poorly organized.

Beyond Textbooks: Free Course Materials That Boost Learning

OER is about more than just textbooks. The same platforms deliver a wealth of supplementary materials that can deepen your understanding without costing a cent.

Video lectures and simulations. MIT OpenCourseWare and MERLOT offer recorded lectures, interactive simulations, and virtual labs. When I was studying physics, I used a MERLOT simulation that let me adjust friction and mass in real time—something no static textbook page can do. That kind of hands-on practice is especially valuable for STEM courses where abstract concepts are hard to visualize.

Practice quizzes and homework platforms. LibreTexts and OpenStax both include built-in practice problems with instant feedback. LibreTexts even has a homework platform called LibreTexts Homework that generates randomized problems. I used it to prep for my calculus final, and the immediate grading helped me catch mistakes before the real exam.

Full courses with syllabi and assignments. If you want to self-study a subject, MIT OpenCourseWare and OER Commons offer complete course packages—lecture notes, problem sets, exams, and sometimes even grading rubrics. You can essentially take a college course for free, at your own pace.

One surprising insight: using OER supplementary materials often improves my understanding more than the assigned textbook did. The interactive nature of simulations and the ability to rewatch lectures as many times as I need means I actually learn the material, not just memorize it for an exam.

If you're in an online degree program, these resources are especially valuable. Many online courses rely on publisher-provided digital platforms that charge $100 per access code. OER offers a free alternative that doesn't expire at the end of the semester—you can keep the material forever, which is great for future reference or review.

Frequently Asked Questions About Open Educational Resources

Are open educational resources really free to use?
Yes—most OER are openly licensed (e.g., Creative Commons), meaning you can access, download, and sometimes modify them at no cost. Always check the specific license.

How can I find OER for my specific class or major?
Start with platforms like OpenStax for popular subjects, or use OER Commons and MERLOT to filter by discipline, level, and type of material.

Do professors actually accept OER in place of traditional textbooks?
Many do—especially in intro courses. Check your syllabus first, or suggest OER to your instructor using resources like the Open Textbook Library.

What is the difference between OER and just a free PDF online?
OER are legally free and openly licensed for reuse, while a free PDF might be pirated or limited. OER guarantees you can use it without copyright issues.

Can I save more than $1,000 per semester by using OER?
Absolutely—if you replace even two or three traditional textbooks with OER, savings can easily exceed $1,000 per semester, especially in high-cost fields like science or business.

Practical Takeaway
Start this semester by checking your syllabus against OpenStax, OER Commons, and the Open Textbook Library. Replace one high-cost textbook with a free OER—that's $150–$200 saved in under an hour. If you repeat that for two courses each semester, you'll save $1,000+ without sacrificing quality. Worth bookmarking this page before your next course registration—your wallet will thank you.