RAMARTIN  I tried to use this, but the user interface is, like so many Java apps, horrible. It's too bad, since the features of this app seem nice. I was eager to create a layout from the measurements I have, but the awkward zooming, crude positioning and wretched data input left me exhausted after just a couple of walls.

This has a lot of promise, though. It seemed quite stable and ran quickly. The basic features appear well-focused and useful. But the drawing tools need a lot of work.  
(Version 1.0)