Some more free ones: Abstract Algebra by Judson - https://judsonbooks.org/abstract-algebra-theory-and-applications/ https://judsonbooks.org/abstract-algebra-th

Some more free ones: Abstract Algebra by Judson - https://judsonbooks.org/abstract-algebra-theory-and-applications/ https://judsonbooks.org/abstract-algebra-theory-and-applicat... Linear Algebra by Hefferon - https://hefferon.net/linearalgebra/ https://hefferon.net/linearalgebra/ Real Analysis by Lebl - https://www.jirka.org/ra/ https://www.jirka.org/ra/ Differential Equations by Lebl - https://www.jirka.org/diffyqs/ https://www.jirka.org/diffyqs/ These should be enough to give you a first and second year undergrad level education in mathematics (minus stats&probability).