Free Books and Learning Games
One complete, free course per subject — five mathematics books, five physics books, four chemistry books and five biology books from Grade 1 to bachelor level, all in eight languages — plus fast learning games.
- 4 subjects: mathematics, physics, chemistry and biology, each from Grade 1 to university year 3.
- 19 free books, 705 chapters, every exercise solved.
- Professional track: One Quant Book, 18 free books and 524 chapters on quantitative finance, in English.
- 1231 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.