Calculus by Michael SpivakAlgebra by Paolo AluffiVisual Complex Analysis by Tristan NeedhamA Book of Abstract Algebra by Charles C. PinterPrinciples of Mathematical Analysis by Walter Rudin
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An Introduction to Statistical Learning by Gareth JamesIntroduction to Linear Algebra by Gilbert StrangCalculus by Michael SpivakHow to Think Like a Mathematician by Kevin HoustonPrinciples of Mathematical Analysis by Walter Rudin
Mathematics Prelims (University of Oxford)
5th out of 77 books — 21 voters
Introduction to Electrodynamics by David J. GriffithsIntroduction to Electrodynamics by David J. GriffithsClassical Mechanics by Charles P. Poole Jr.Principles of Mathematical Analysis by Walter RudinClassical Electrodynamics by John David Jackson
How to prepare for Part III (University of Cambridge)
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Real and Complex Analysis by Walter RudinPrinciples of Mathematical Analysis by Walter RudinAlgebra by Thomas W. HungerfordIntroduction To Commutative Algebra by Atiyah M.F.Representations and Characters of Groups by Gordon James
Mathematics Year 3 (MCSL)
2nd out of 81 books — 7 voters
Introduction to Electrodynamics by David J. GriffithsFeynman Lectures on Physics Vol 2 by Richard P. FeynmanConvex Optimization by Stephen BoydThe Feynman Lectures on Physics Vol 3 by Richard P. FeynmanVisual Complex Analysis by Tristan Needham
Mathematics Part IB (University of Cambridge)
7th out of 92 books — 9 voters

Understanding Analysis by Stephen AbbottThe Cauchy-Schwarz Master Class by J. Michael SteeleHow to Think About Analysis by Lara AlcockDiv, Grad, Curl, and All That by Harry M. ScheyPrinciples of Mathematical Analysis by Walter Rudin
Real Analysis (MMath)
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Gödel, Escher, Bach by Douglas R. HofstadterFermat's Enigma by Simon SinghFlatland by Edwin A. AbbottThe Code Book by Simon SinghZero by Charles Seife
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408th out of 453 books — 674 voters

Calculus Made Easy by Silvanus Phillips ThompsonFifty Challenging Problems in Probability with Solutions by Frederick MostellerBasic Mathematics by Serge LangPrecalculus Mathematics in a Nutshell by George F. SimmonsThe Princeton Companion to Mathematics by Timothy Gowers
MATH
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Machine Learning by Samuel HackReal and Complex Analysis by Walter RudinVisual Complex Analysis by Tristan NeedhamOn Numbers and Games by John H. ConwayInside Interesting Integrals by Paul J. Nahin
Not Pop-Science - Mathematics
34th out of 111 books — 10 voters

Introductory Statistics with R by Peter DalgaardAn Introduction to Statistical Learning by Gareth JamesThe Art of R Programming by Norman MatloffExtending the Linear Model with R by Julian James FarawayR for Data Science by Hadley Wickham
Open Syllabus R Books
62nd out of 83 books — 1 voter
Calculus by James StewartIntermediate Algebra by K. Elayn Martin-GayCalculus by Ron LarsonElementary Statistics by Mario F. TriolaPrecalculus by Michael   Sullivan
Open Syllabus Mathematics Books
24th out of 100 books — 1 voter

Calculus by Michael SpivakIntroductory Discrete Mathematics by V.K. BalakrishnanIntroduction to Topology by Bert MendelsonA Book of Abstract Algebra by Charles C. PinterElements of point set topology by John D. Baum
The Math Sorcerer's Epic Math Book List
29th out of 57 books — 2 voters
e by Eli MaorThe Joy of X by Steven H. StrogatzFermat's Enigma by Simon SinghThe Man Who Loved Only Numbers by Paul HoffmanThe Man Who Knew Infinity by Robert Kanigel
So You Want to Study Mathematics… by Susan Rigetti
22nd out of 45 books — 1 voter

Discrete Mathematics with Applications by Susanna S. EppDiscrete Mathematical Structures by Bernard KolmanMathematical Proofs by Gary ChartrandAn Introduction to Abstract Mathematics by Robert J. BondAGS Pre-Algebra by Siegfried Haenisch
undergraduate math books
23rd out of 40 books — 1 voter