All about maths for fun
- MITMath!!!
- 3Blue1Brown
- Art of Problem-Solving
- Wolfram MathWorld
- Encyclopedia of Mathematics
- Plus Math
- Math Insight
- Chaos
- Dimensions
- GeoGebra
- Project Euler
- Math Handbook
- Numerical Methods Project
- Holistic Numerical Methods
- Better Explained
- 线代启示录
- Mathematics and the Making of the Modern and Future World
- Byrne’s Euclid The first six books of The Elements of Euclid with Coloured Diagrams and Symbols
- 数立方
- Immersive Linear Algebra
- Symmetry and Separation of Variables
- （北京大学）数学物理方法 by 吴崇试