What wording would you use? I honestly have no idea how to describe Wayfire in other terms that would be more understandable to the majority of people.
Maybe rather than saying what it is straight away, say what it does and why you'd want it. "Wayfire: awesome visual effects for your Linux desktop" and then go on to say what it is.
You might even have a short bullet list of reasons to use it rather than just a tagline.
You might even have a short bullet list of reasons to use it rather than just a tagline.