Free Books and Learning Games
One complete, free course per subject — five mathematics books, five physics books, four chemistry books, five biology books and five Earth and space sciences books from Grade 1 to bachelor level, all in eight languages — plus fast learning games.
- 5 subjects: mathematics, physics, chemistry, biology and Earth and space sciences, each from Grade 1 to university year 3.
- 24 free books, 856 chapters, every exercise solved.
- Professional track: One Quant Book, 20 free books and 558 chapters on quantitative finance, in English.
- 1416 chapters readable online in English, French, Dutch, Spanish, Portuguese, Hindi, Arabic and Indonesian — free, no account.
- 3 free learning games: mental math, vocabulary, and world geography.
- Open source: the books are written in LaTeX and developed openly on GitHub. Free forever, no ads.