Emanuel Berg wrote:
> Librecad seems good and I got it working
> instantly on a Debian box.
>
> Only how do I draw a box and then change the
> properties to specific side lengths?
> ....
You might find useful information
at the LibreCAD site ....
http://librecad.org/cms/home.html
http://wiki.librecad.org/index.php/Main_Page
The command-line interface could be useful
for setting particular properties ....
http://wiki.librecad.org/index.php/A_short_manual_for_use_from_the_command_line
YouTube videos ....
https://www.youtube.com/results?search_query=librecad&oq=librecad
--
Stanley C. Kitching
Human Being
Phoenix, Arizona