...The README is structured as an index with general programming books, followed by sections for specific languages such as JavaScript, TypeScript, Python, Ruby, Rust, PHP, Haskell, Go, Kotlin, Java, and R.Each entry includes the book title, author, and a link to the official or legal free version (PDF, HTML, eBook, etc.), focusing on resources that are legitimately available. Beyond languages, the list also covers frameworks and libraries (like React and Qwik), tools (such as Git), and databases (SQL), grouping them in separate sections for easier browsing. The repository includes a code of conduct and contributing guidelines, inviting the community to help maintain the catalog and keep links up to date.