Free Books and Learning Games
One complete, free course per subject — five mathematics books from Grade 1 to bachelor level, high-school physics in six languages — plus fast learning games.
- 2 subjects: mathematics (Grade 1 to university year 3) and physics (high school).
- 6 free books, 210 chapters, every exercise solved.
- 212 chapters readable online in English, French, Dutch and Spanish — 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.