Dating from 2015, this is a fifteen-chapter free online textbook in PDF format, intended for a one-semester course in microeconomic theory. It is Canadian in origin, but the examples are international.
"An understanding of individual optimizing behaviour is developed, and this behaviour is in turn used to link household decisions on savings with firms' decisions on production, expansion and investment. The text then explores behaviour in a variety of different market structures. The role of the government is examined, and the key elements in the modern theory of international trade are developed."