Curated list of online books

Here is a list of online books with interesting design and good typesetting, that I have found:

• Butterick’s Practical Typography
  Subject: Typography
• The Art of Chance by Dennis Sun, Gene Kim, and Anav Sood
  Subject: Probability
• Interactive Linear Algebra by Dan Margalit, Joseph Rabinoff
  Subject: Linear Algebra
• Introduction to Modern Statistics by Mine Çetinkaya-Rundel and Johanna Hardin
  Subject: Statistics
• MathNotes
  Subject: Math
• Plugging my own work-in-progress book: A Grammar of Standard Classical Arabic
  Subject: Arabic