Description: Brilliant.org is an online platform that offers math and science problems and courses to help people improve their logical reasoning and problem-solving abilities. It uses interactive quizzes and puzzles to make STEM subjects more engaging.
Type: software
Description: Wikibooks is an open collection of textbooks and study guides that anyone can contribute to. It aims to create high-quality textbooks and learning materials that are free for anyone to access.
Type: software