Desktop publishing the open way
One of my favorite apps at the moment is a free and open source desktop publishing tool: Scribus.
You can create template pages and even measured drawings of e.g. a floor plan. Only caveat: the GUI isn’t very Mac-like (it is based on the “Qt” framework) and even worth the behavior is sometimes a bit wired: selected text (looks like selected text) isn’t selected. But: it’s for free and maybe there will be an update soon (version I use: 1.3.9).