The documentation is only available on the web. It consists of the Website, Github repository, User Manual, old Wiki, Forum, Forum chat and IRC #librecad.
The LibreCAD User Manual is the primary source of user documentation and, combined with this wiki's tutorials and how-to, supercedes the old wiki.
The manual contains:
Note: These manuals are for older versions of LibreCAD and may not reflect the command or layout found in the latest release of LibreCAD.