Is there a mockup/authoring system for linux that I can use to mockup gui interfaces? I want to be able to create pages of screens with button that link to other pages. I first want to use this to document out current app. Then I want to use it to create a new version so that others can review the approach I want to take.

I am first looking at libreoffice because you can draw primitives very easy. It has a scripting backend as well. I had used authoring systems years ago (20 years) on old black and white macs. I have not seen systems like that in a while. Searching for authoring systems for linux brings up a lot of web based ones. I don't want to mock it up on web if I can help it, but it could work if it did relative links to html files in the same directory. That way any browser would work.

I really just don't know what the state of the art tools used for this. Probably using terms I don't recognize.