Overture is impressive in its inclusiveness, from article: "There’s also one-line support for animating views. You declare the layout property and its dependencies, and Overture will handle animating it between the different states. Full support for drag and drop, localisation, keyboard shortcuts, inter-tab communication, routing and more mean you have everything you need to build an awesome app."

Especially having pre-fixed inter-tab comm. sounds enticing for me, haven't heard of other frameworks handling this out of the box!