There are several plug-in included with LibreCAD, but I have not found descriptions of them. If anyone has a description of the plug-ins, please post a link or response to this posting. Thanks in advance.
( The status has been moved to the read me file, "readme.md", on the Github document web site. )
These items are available as a linked / navigable documents and sections that would allow users to find the specifics that are needed.