12 More Enlightening Free Linux Books The purpose of this article is to identify insightful and well written Linux books that can be downloaded without charge. The majority of the books featured in this article are themselves released under an open source license. All of the books featured here are written in English. (Read more) The Cathedral & The Bazaar The Cathedral and the Bazaar is a book on software engineering methods, based on the author's observations of the Linux kernel development process and his experiences managing an open source project, fetchmail. Read more