The Document Liberation Project has already developed a dozen of import libraries which have been integrated by software such as: Abiword, Calligra, CorelDRAW File Viewer, Inkscape, LibreOffice and Scribus. Besides short overview of motivations behind the project creation, this lecture will present the technical details of the framework used by the Document Liberation Project, as well as the different home-brewed introspection tools that we use. This are all free software tools that can be of use for wide range of other FLOSS projects.