_Reactive_  is a simple foundation for programming reactive systems
functionally. Like Fran/FRP, it has a notions of (reactive) behaviors and
events. Like DataDriven , Reactive has a data-driven implementation.
The inspiration for Reactive was Mike Sperber's Lula  implementation of
FRP. Mike used blocking threads, which I had never considered for FRP.
While playing with the idea, I realized that I could give a very elegant
and efficient solution to caching, which DataDriven doesn't do. (For an
application "f <*> a" of a varying function to a varying argument, caching
remembers the latest function to apply to a new argument and the last
argument to which to apply a new function.)
The theory and implementation of Reactive are described in the paper "Simply
efficient functional reactivity" .
Note that cabal, version 22.214.171.124 or greater is required for installation.
You can configure, build, and install all in the usual way with Cabal
runhaskell Setup.lhs configure
runhaskell Setup.lhs build
runhaskell Setup.lhs install