The Sourdough Framework is an open-source book that provides a framework for making sourdough bread at home, focusing on the science behind natural fermentation. The book is available in various formats, including PDF, EPUB, and HTML, and can be compiled using Docker or LaTeX. The author aims to provide a comprehensive guide that can be adapted to different environments and ingredients. The book is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.