Currently in private beta
Waxwing isn't publicly available yet. It's currently being tested by Mika Haulo, the developer of Waxwing. He's been using it in his own projects for several months and everything has been working nicely. However, certain things need to be tweaked and polished before it makes a good commercial product.
Just in case the screenshots above get you intrigued enough so that you'd like to be an early bird user, say hello at mika@laukkasolutions.com and you might get lucky.