Functional Reactive Event Driver - a lightweight Java library aims to facilitate writing asychronous event-driven systems by Functional Reactive Programming.
Java 8 comes with CompletableFuture and Stream, which is great. But would it not be even nicer if we could have something that combines both, like the way in Functional Reactive Programming which allows write functional style operations on one or more async streams.
FunctionalReactives is your friend to write simple Java codes in a Functional Reactive style. (and it's on Java 6!)