The driving force of our not-for-profit activities is removing economical obstacles to gaining knowledge and promoting access to valuable and verified content on the internet. Our textbooks are licensed under a CC BY 4.0 license, which means users can legally download, copy and modify the copied content for free. The only condition is one references the OpenStax Poland foundation when quoting fragments from our textbooks. We published Polish adaptations of ‘University Physics’ in 2018, ‘Psychology’ in 2020, ‘Principles of Microeconomics’ in 2022 and ‘Principles of Macroeconomics’ in 2023. With the beginning of the 2024/25 academic year, we published ‘Principles of Marketing’.