Science and Math

Core STEM

• Khan Academy Math - School and college math lessons with practice.
• Khan Academy Science - Biology, chemistry, physics, and health lessons.
• PhET Interactive Simulations - Interactive STEM simulations for classrooms and self-study.
• OpenStax Subjects - Open textbooks for science, math, and social science.
• LibreTexts - Open textbook library across STEM subjects.
• TIB AV-Portal - Scientific lecture and research video archive.
• LabXchange - Science learning modules, pathways, and lab simulations.
• JavaLab - Interactive science simulations and visual experiments.
• EduMedia - Science animations and classroom-ready interactives.
• Academo - Interactive demonstrations for math, physics, and computing.
• AnimaGraffs - Animated visual breakdowns of engineering, biology, and technical systems.

Mathematics

• LibreTexts Math - Open math textbooks and topic chapters.
• GeoGebra - Graphing, geometry, and interactive math tools.
• Desmos - Graphing calculator and classroom math activities.
• WolframAlpha - Computational answers and symbolic problem solving.
• Wolfram MathWorld - Math encyclopedia with definitions and formulas.
• ProofWiki - Encyclopedia of mathematical proofs.
• Open Logic Project - Logic textbooks and proof resources.
• BetterExplained - Intuitive math explanations.
• Paul's Online Math Notes - Algebra, calculus, and differential equations notes.
• Art of Problem Solving Alcumus - Adaptive problem-solving practice.
• Mathigon - Interactive math lessons and visual courses.
• OEIS - Encyclopedia of integer sequences.
• Project Euler - Math and programming challenge problems.
• Seeing Theory - Interactive probability and statistics lessons.
• 3Blue1Brown - Visual math videos and series.

Physics

• The Feynman Lectures on Physics - Classic Caltech physics lectures online.
• Physics LibreTexts - Open physics textbooks and topic modules.
• PhET Physics - Physics simulations by topic.
• Physics Classroom - High-school physics tutorials and practice.
• HyperPhysics - Concept maps and reference pages for physics.
• Motion Mountain - Free physics textbook series.
• Isaac Physics - Physics problems and guided practice.
• Bartosz Ciechanowski - Deep interactive explainers for physics and systems.
• Physics Aviary - Physics labs, tools, and simulations.
• Falstad Math and Physics - Browser-based physics and math simulations.
• oPhysics - Interactive physics demonstrations.
• MyPhysicsLab - Physics simulation models and explanations.

Physics Video Courses

• MIT 8.01 Physics I on YouTube - YouTube playlist for the same mechanics lectures.
• MIT 8.02 Physics II on YouTube - YouTube playlist for the electromagnetism lectures.
• MIT 8.03 Physics III on YouTube - YouTube playlist for the waves lectures.
• The Mechanical Universe - Caltech physics lecture series.
• The Theoretical Minimum - Leonard Susskind's Stanford theoretical physics courses.
• Yale PHYS 200: Fundamentals of Physics I - Introductory mechanics from Yale Open Courses.
• Yale PHYS 201: Fundamentals of Physics II - Introductory electromagnetism and waves from Yale.
• MIT 8.04 Quantum Physics I - MIT's first quantum physics course.
• MIT 8.05 Quantum Physics II - MIT's second quantum physics course.
• Harvard Physics 253: Quantum Field Theory - Sidney Coleman's quantum field theory lectures.
• Fredric Schuller Quantum Theory - Advanced lecture series on quantum theory.
• Fredric Schuller General Relativity - Mathematical foundations of general relativity.
• Kip Thorne Gravitational Waves - Caltech gravitational waves lecture series.

Chemistry

• LibreTexts Chemistry - Open chemistry textbooks and modules.
• PhET Chemistry - Chemistry simulations by topic.
• OpenStax Chemistry - Free general chemistry textbook.
• PubChem - Chemical compound and substance database.
• NIST Chemistry WebBook - Reference data for chemical species.
• Ptable - Interactive periodic table.
• WebElements - Periodic table and element reference.
• Chemguide - Chemistry study notes and explanations.
• The Organic Chemistry Tutor - Chemistry and math video lessons.
• Compound Interest - Chemistry infographics and explainers.
• ChemTube3D - Interactive 3D chemistry structures and mechanisms.
• Yale CHEM 125A: Freshman Organic Chemistry I - Yale organic chemistry course part one.
• Yale CHEM 125B: Freshman Organic Chemistry II - Yale organic chemistry course part two.

Biology

• Khan Academy Biology - Biology lessons from cells to ecology.
• OpenStax Biology 2e - Free college biology textbook.
• PhET Biology - Biology simulations and classroom interactives.
• LibreTexts Biology - Open biology textbooks and chapters.
• BioNinja - IB biology notes and diagrams.
• The Biology Project - Biology tutorials and problem sets.
• Biodiversity Heritage Library - Biodiversity literature and historical biology texts.
• OneZoom Tree of Life - Interactive tree of life explorer.
• UniProt - Protein sequence and function database.
• iNaturalist - Community organism identification and observations.

Engineering

• The Engineering Toolbox - Engineering formulas, tables, and calculators.
• Engineers Edge - Engineering references, standards, and calculators.
• LibreTexts Engineering - Open engineering textbooks.
• NPTEL Engineering Courses - Indian university engineering lecture courses.
• Sanfoundry - Engineering Q&A and practice questions.
• KiCad - Open-source PCB and electronics design suite.
• Wokwi - Arduino and ESP32 circuit simulations.
• HDLBits - Digital logic and Verilog practice problems.
• Electronics Tutorials - Electronics theory lessons and guides.
• Battery University - Battery chemistry and usage education.

Space and Astronomy

• NASA - NASA missions, science, history, and learning resources.
• NASA Images - NASA image, video, and audio archive.
• NASA Eyes - Interactive 3D space visualizations.
• ESA - European Space Agency missions and educational material.
• JAXA - Japanese space agency missions and media.
• ISRO - Indian space program news and mission information.
• In The Sky - Astronomy guides, charts, and observing tools.
• Stellarium Web - Browser-based planetarium.
• Worldwide Telescope - Interactive telescope and sky data explorer.
• Astronomy Picture of the Day - Daily astronomy image with explanation.
• Map of the Universe - Interactive cosmic scale map.
• Solar System Scope - Solar system and night sky simulation.

Mathematics Video Courses

• MIT 18.01 Single Variable Calculus - MIT calculus course with lectures and materials.
• MIT Calculus Revisited: Single Variable Calculus - Refresher lectures for single-variable calculus.
• MIT 18.02 Multivariable Calculus - MIT multivariable calculus course.
• MIT 18.03 Differential Equations - MIT differential equations course.
• MIT 18.06SC Linear Algebra - Gilbert Strang's linear algebra course.
• MIT 18.085 Computational Science and Engineering I - Numerical methods and applied math course.
• MIT 18.100A Real Analysis - MIT real analysis video lectures.
• MIT 18.100B Real Analysis - Second MIT real analysis lecture series.
• Harvard Statistics 110: Probability - Harvard probability course by Joe Blitzstein.
• MIT Probabilistic Systems Analysis - MIT probability and applied stochastic systems.
• Gilbert Strang Highlights of Calculus - Conceptual calculus lecture series.
• Stanford Introduction to Mathematical Thinking - Stanford course on proof-oriented mathematical thinking.
• Princeton Linear Algebra - Princeton linear algebra lectures.
• University of Maryland Differential Equations for Engineers - Engineering differential equations playlist.
• NPTEL Mathematics Courses - Mathematics course catalog from NPTEL.