polymath
Bluelight Crew
There are several relatively old (and some newer, too) textbooks in physics, mathematics and other sciences, that technically don't have an expired copyright but no one seems to care if someone uploads them in pdf form on personal university web pages and other internet sites. There are also good lecture notes on several subjects freely available online. I will list some of these books and lecture notes here, just in case there are bluelighters who are studying these subjects and could benefit from them. For the lecture notes, I will post links (and none of them are crappy handwritten notes). Even though it seems that courts don't consider simply linking to pirated material to be illegal, I will not give direct links to pdf versions of copyrighted books, but I have checked that all of them can be easily found with Google by writing the surname of the author, the name of the book and the word "pdf" as search terms (on the first page of the search results there will be a link to a page that has the full book in pdf form with no fake download links). If you significantly benefit from reading some book you find online, I recommend that you actually purchase it. Most of you probably find reading an actual physical book more comfortable than reading the book from a computer screen.
Chemistry
Zumdahl, "Chemistry"
Housecroft, Sharpe, "Inorganic Chemistry"
Harris, "Quantitative Chemical Analysis"
McMurry, "Organic Chemistry"
Smith, March, "March's Advanced Organic Chemistry"
R.G. Mortimer, "Physical Chemistry"
Atkins, Friedman, "Molecular Quantum Mechanics"
Mathematics
David C. Lay, "Linear Algebra and its Applications"
Tom Apostol, "Mathematical Analysis"
Courant, John, "Introduction to Calculus and Analysis"
Susanna S. Epp, "Discrete Mathematics with Applications"
Kenneth Falconer, "Fractal Geometry, Mathematical Foundations and Applications"
Royden, Fitzpatrick, "Real Analysis"
Greenberg, "Euclidean and non-euclidean geometries"
George B. Arfken, "Mathematical Methods for Physicists"
Mary Boas, "Mathematical Methods in the Physical Sciences"
Hassani, "Mathematical Physics"
Eva Kaslik, Calculus lecture notes: http://web.info.uvt.ro/~kaslik/pdf/calculus.pdf
Ian Craw, Lecture notes for calculus and analysis: http://web.iyte.edu.tr/~tinabeseri/forstudents/Advanced Calculus and Analysis.pdf
David Lerner, Linear algebra lecture notes: https://www.math.ku.edu/~lerner/LAnotes/LAnotes.pdf
Keith Matthews, Lecture notes for linear algebra: http://www.numbertheory.org/book/
Donald R. Kreher, Group theory lecture notes: http://www.math.mtu.edu/~kreher/ABOUTME/syllabus/GTN.pdf
L. Lovasz, Lecture notes for discrete mathematics: https://www.cims.nyu.edu/~regev/teaching/discrete_math_fall_2005/dmbook.pdf
Thomas W. Judson, Free abstract algebra textbook: http://abstract.ups.edu/download/aata-20160809.pdf
Paul Garrett, Abstract algebra lecture notes: http://www.math.umn.edu/~garrett/m/algebra/notes/Whole.pdf
D.S. Malik, Abstract algebra lecture notes: https://people.creighton.edu/~dsm33733/MTH581/Introduction to Abstract Algebra.pdf
Peter J. Cameron, Number theory lecture notes: http://www.maths.qmul.ac.uk/~pjc/notes/nt.pdf
Lou van den Dries, Mathematical logic lecture notes: http://www.math.uiuc.edu/~vddries/main.pdf
Colorado State University, Topology lecture notes: http://www.math.colostate.edu/~renzo/teaching/Topology10/Notes.pdf
Christian Berg, Complex analysis lecture notes: http://www.math.ku.dk/noter/filer/koman-12.pdf
Jeffrey R. Chasnov, Mathematical biology lecture notes: https://www.math.ust.hk/~machas/mathematical-biology.pdf
Jeffrey R. Chasnov, Numerical Methods: https://www.math.ust.hk/~machas/numerical-methods.pdf
Collection of Calculus Problems: http://faculty.ung.edu/jallagan/Cou...ook/problems and solutions for calculus 1.pdf
Collection of Linear Algebra Problems: http://linear.ups.edu/version3/pdf/fcla-draft-solutions.pdf
Collection of Group Theory Problems: https://www.dpmms.cam.ac.uk/~oh233/old/algebra1/book.pdf
Physics
Young, Freedman, "University Physics with Modern Physics"
Marion, Thornton, "Classical Dynamics of Particles and Systems"
Goldstein, "Classical Mechanics"
Griffiths, "Introduction to Electrodynamics"
Jackson, "Classical Electrodynamics"
Landau, Lifshitz, "Theory of Elasticity"
Incropera, "Fundamentals of Heat and Mass Transfer"
White, "Fluid Mechanics"
Griffiths, "Introduction to Quantum Mechanics"
Sakurai, "Modern Quantum Mechanics"
Schaum's Outlines, "Quantum Mechanics"
Chandler, "Introduction to Modern Statistical Mechanics"
Bruus, Flensberg, "Many-Body Quantum Theory in Condensed Matter Physics"
Martin, Shaw, "Particle Physics"
Peskin, Schroeder, "An Introduction to Quantum Field Theory"
Bergstrom, Goobar, "Cosmology and Particle Astrophysics"
Online version of "Feynman lectures on physics": http://www.feynmanlectures.caltech.edu/
Robert G. Brown, Elementary mechanics lecture notes: https://www.phy.duke.edu/~rgb/Class/intro_physics_1/intro_physics_1.pdf
Robert G. Brown, Electricity and magnetism lecture notes: http://www.phy.duke.edu/~rgb/Class/intro_physics_2/intro_physics_2.pdf
David Tong, Classical mechanics lecture notes: http://www.damtp.cam.ac.uk/user/tong/dynamics/clas.pdf
James Sparks, Electromagnetism lecture notes: http://users.ox.ac.uk/~math0391/EMlectures.pdf
Gregory Falkovich, Fluid mechanics lecture notes: https://www.weizmann.ac.il/complex/....ac.il.complex.falkovich/files/FluidShort.pdf
Kimmo Tuominen, Quantum mechanics lecture notes: http://www.courses.physics.helsinki.fi/teor/qme/kvanttiI_notes2014.pdf
Martin Plenio, Quantum mechanics lecture notes: http://www3.imperial.ac.uk/pls/portallive/docs/1/613904.PDF
Weng Cho Chew, Quantum mechanics lecture notes: http://wcchew.ece.illinois.edu/chew/course/QMALL20121005.pdf
David Tong, Lecture notes for statistical physics: http://www.damtp.cam.ac.uk/user/tong/statphys/sp.pdf
Luca Amendola, Lecture notes for statistical physics: http://www.thphys.uni-heidelberg.de/~amendola/statphys/statphys.pdf
Steven H. Simon, Lecture notes for solid state physics: https://www-thphys.physics.ox.ac.uk/people/SteveSimon/condmat2012/LectureNotes2012.pdf
David Tong, Quantum field theory lecture notes: http://www.damtp.cam.ac.uk/user/tong/qft/qft.pdf
Gerard 't Hooft, General relativity lecture notes: http://www.staff.science.uu.nl/~hooft101/lectures/genrel_2010.pdf
Raymond E. Frey, Analog electronics lecture notes: http://pages.uoregon.edu/rayfrey/AnalogNotes.pdf
Raymond E. Frey, Digital electronics lecture notes: http://pages.uoregon.edu/rayfrey/DigitalNotes.pdf
Biology
VanPutte, Regan, Russo, "Seeley's Essentials of Anatomy and Physiology"
Guyton, Hall, "Textbook of Medical Physiology"
Alberts, "Essential Cell Biology"
Squire, "Fundamental Neuroscience"
Hodgson, "A Textbook of Modern Toxicology"
Computer science
Press, Teukolsky, Vetterling, Flannery, "Numerical Recipes in C"
Lippman, Lajoie, Moo: "C++ Primer"
Java programming notes: http://math.hws.edu/eck/cs124/downloads/javanotes5-linked.pdf
Test small pieces of code online: http://ideone.com/
Psychology
Barlow, "Abnormal Psychology: An Integrative Approach"
Beaumont, "Introduction to Neuropsychology"
Chemistry
Zumdahl, "Chemistry"
Housecroft, Sharpe, "Inorganic Chemistry"
Harris, "Quantitative Chemical Analysis"
McMurry, "Organic Chemistry"
Smith, March, "March's Advanced Organic Chemistry"
R.G. Mortimer, "Physical Chemistry"
Atkins, Friedman, "Molecular Quantum Mechanics"
Mathematics
David C. Lay, "Linear Algebra and its Applications"
Tom Apostol, "Mathematical Analysis"
Courant, John, "Introduction to Calculus and Analysis"
Susanna S. Epp, "Discrete Mathematics with Applications"
Kenneth Falconer, "Fractal Geometry, Mathematical Foundations and Applications"
Royden, Fitzpatrick, "Real Analysis"
Greenberg, "Euclidean and non-euclidean geometries"
George B. Arfken, "Mathematical Methods for Physicists"
Mary Boas, "Mathematical Methods in the Physical Sciences"
Hassani, "Mathematical Physics"
Eva Kaslik, Calculus lecture notes: http://web.info.uvt.ro/~kaslik/pdf/calculus.pdf
Ian Craw, Lecture notes for calculus and analysis: http://web.iyte.edu.tr/~tinabeseri/forstudents/Advanced Calculus and Analysis.pdf
David Lerner, Linear algebra lecture notes: https://www.math.ku.edu/~lerner/LAnotes/LAnotes.pdf
Keith Matthews, Lecture notes for linear algebra: http://www.numbertheory.org/book/
Donald R. Kreher, Group theory lecture notes: http://www.math.mtu.edu/~kreher/ABOUTME/syllabus/GTN.pdf
L. Lovasz, Lecture notes for discrete mathematics: https://www.cims.nyu.edu/~regev/teaching/discrete_math_fall_2005/dmbook.pdf
Thomas W. Judson, Free abstract algebra textbook: http://abstract.ups.edu/download/aata-20160809.pdf
Paul Garrett, Abstract algebra lecture notes: http://www.math.umn.edu/~garrett/m/algebra/notes/Whole.pdf
D.S. Malik, Abstract algebra lecture notes: https://people.creighton.edu/~dsm33733/MTH581/Introduction to Abstract Algebra.pdf
Peter J. Cameron, Number theory lecture notes: http://www.maths.qmul.ac.uk/~pjc/notes/nt.pdf
Lou van den Dries, Mathematical logic lecture notes: http://www.math.uiuc.edu/~vddries/main.pdf
Colorado State University, Topology lecture notes: http://www.math.colostate.edu/~renzo/teaching/Topology10/Notes.pdf
Christian Berg, Complex analysis lecture notes: http://www.math.ku.dk/noter/filer/koman-12.pdf
Jeffrey R. Chasnov, Mathematical biology lecture notes: https://www.math.ust.hk/~machas/mathematical-biology.pdf
Jeffrey R. Chasnov, Numerical Methods: https://www.math.ust.hk/~machas/numerical-methods.pdf
Collection of Calculus Problems: http://faculty.ung.edu/jallagan/Cou...ook/problems and solutions for calculus 1.pdf
Collection of Linear Algebra Problems: http://linear.ups.edu/version3/pdf/fcla-draft-solutions.pdf
Collection of Group Theory Problems: https://www.dpmms.cam.ac.uk/~oh233/old/algebra1/book.pdf
Physics
Young, Freedman, "University Physics with Modern Physics"
Marion, Thornton, "Classical Dynamics of Particles and Systems"
Goldstein, "Classical Mechanics"
Griffiths, "Introduction to Electrodynamics"
Jackson, "Classical Electrodynamics"
Landau, Lifshitz, "Theory of Elasticity"
Incropera, "Fundamentals of Heat and Mass Transfer"
White, "Fluid Mechanics"
Griffiths, "Introduction to Quantum Mechanics"
Sakurai, "Modern Quantum Mechanics"
Schaum's Outlines, "Quantum Mechanics"
Chandler, "Introduction to Modern Statistical Mechanics"
Bruus, Flensberg, "Many-Body Quantum Theory in Condensed Matter Physics"
Martin, Shaw, "Particle Physics"
Peskin, Schroeder, "An Introduction to Quantum Field Theory"
Bergstrom, Goobar, "Cosmology and Particle Astrophysics"
Online version of "Feynman lectures on physics": http://www.feynmanlectures.caltech.edu/
Robert G. Brown, Elementary mechanics lecture notes: https://www.phy.duke.edu/~rgb/Class/intro_physics_1/intro_physics_1.pdf
Robert G. Brown, Electricity and magnetism lecture notes: http://www.phy.duke.edu/~rgb/Class/intro_physics_2/intro_physics_2.pdf
David Tong, Classical mechanics lecture notes: http://www.damtp.cam.ac.uk/user/tong/dynamics/clas.pdf
James Sparks, Electromagnetism lecture notes: http://users.ox.ac.uk/~math0391/EMlectures.pdf
Gregory Falkovich, Fluid mechanics lecture notes: https://www.weizmann.ac.il/complex/....ac.il.complex.falkovich/files/FluidShort.pdf
Kimmo Tuominen, Quantum mechanics lecture notes: http://www.courses.physics.helsinki.fi/teor/qme/kvanttiI_notes2014.pdf
Martin Plenio, Quantum mechanics lecture notes: http://www3.imperial.ac.uk/pls/portallive/docs/1/613904.PDF
Weng Cho Chew, Quantum mechanics lecture notes: http://wcchew.ece.illinois.edu/chew/course/QMALL20121005.pdf
David Tong, Lecture notes for statistical physics: http://www.damtp.cam.ac.uk/user/tong/statphys/sp.pdf
Luca Amendola, Lecture notes for statistical physics: http://www.thphys.uni-heidelberg.de/~amendola/statphys/statphys.pdf
Steven H. Simon, Lecture notes for solid state physics: https://www-thphys.physics.ox.ac.uk/people/SteveSimon/condmat2012/LectureNotes2012.pdf
David Tong, Quantum field theory lecture notes: http://www.damtp.cam.ac.uk/user/tong/qft/qft.pdf
Gerard 't Hooft, General relativity lecture notes: http://www.staff.science.uu.nl/~hooft101/lectures/genrel_2010.pdf
Raymond E. Frey, Analog electronics lecture notes: http://pages.uoregon.edu/rayfrey/AnalogNotes.pdf
Raymond E. Frey, Digital electronics lecture notes: http://pages.uoregon.edu/rayfrey/DigitalNotes.pdf
Biology
VanPutte, Regan, Russo, "Seeley's Essentials of Anatomy and Physiology"
Guyton, Hall, "Textbook of Medical Physiology"
Alberts, "Essential Cell Biology"
Squire, "Fundamental Neuroscience"
Hodgson, "A Textbook of Modern Toxicology"
Computer science
Press, Teukolsky, Vetterling, Flannery, "Numerical Recipes in C"
Lippman, Lajoie, Moo: "C++ Primer"
Java programming notes: http://math.hws.edu/eck/cs124/downloads/javanotes5-linked.pdf
Test small pieces of code online: http://ideone.com/
Psychology
Barlow, "Abnormal Psychology: An Integrative Approach"
Beaumont, "Introduction to Neuropsychology"