A true flux compliant library in a very small size. Actions are fire and forget, stores have no setters, you get constants, and Flux's single dispatcher.
At any point in time you can take a snapshot of the entire application state and then reload it later. This opens the door for easier debugging, hot state reloading, and more.
Do away with defining constants, building your own boilerplate dispatchers, and ugly switch statements.
Feel like ditching singletons, creating instances of each store, and passing them to your view? No problem.
Although optional, Alt is meant to work with ES2015 leveraging the new constructs and syntax for something powerful.