Reactive Thread
Reactive Thread as implemented in ReactiveThread class
is a reactive adapter for Java's 
Thread.
Since Thread is inherently synchronously blocking,
ReactiveThread is implemented as a conceptual analog rather than a wrapper.
ReactiveThread executes reactive computation on a thread pool whenever its dependencies change.
It is a kind of reactive consumer and it can serve as a bridge
that forwards output from its reactive computation to non-reactive APIs.
Download
ReactiveThread is included in core library.
Documentation
See the ReactiveThread class in javadoc.
Since the javadoc is not complete yet, you might want to take a look at comments and implementation
in ReactiveThread.java.