For economics at least, there is this rich online textbook called The Economy, published by The CORE Project (Curriculum in Open-access Resources in Economics).

For economics at least, there is this rich online textbook called The Economy, published by The CORE Project (Curriculum in Open-access Resources in Economics). It's opinionated in its approach, in that it stems from students and instructors believing conceptual economic education as it exists today is fundamentally broken and fails to address inequality effectively. http://www.core-econ.org/the-economy/book/text/0-3-contents.html#contents http://www.core-econ.org/the-economy/book/text/0-3-contents....