conspects
https://au.cdkrot.me

???
https://uchitel.by/catalog/15673/592280/

lists
https://nashol.me/vse-knigi-po-matematike/
http://window.edu.ru/catalog/resources?p_rubr=2.1.11
https://nsportal.ru/shkola/matematika/library/
http://детинн.рф/zanimatelnye-zadachi-s-otvetami/
http://www.math-on-line.com/olympiada-edu/katalog-math-algebra-algebra.html
http://eek.diary.ru/p189363567.htm

big-folder
https://booksedu.ru/books/

Courant Robbins - What is Mathematics
https://drive.google.com/file/d/0B8pVGDOkmwgFdXZmaWpHLUJ3Tk0/view

Strang - Calculus:
https://ocw.mit.edu/ans7870/resources/Strang/Edited/Calculus/Calculus.pdf

Smirnov - Higher Math Course
https://vk.com/wall-54530371_172045

Joy of X
https://drive.google.com/file/d/0B8pVGDOkmwgFY2laSjJ4QVVxZGs/view