The document discusses open source tools and provides an overview of their classes, history, and definition. It describes open source tools as a decentralized form of software production where source code is freely available and modifiable by anyone under the same sharing terms. The document lists classes of open source tools like messaging, business intelligence, and content management tools. It also briefly outlines the history of open source from the 1960s to today and references standards bodies like ISO and frameworks like ITIL.