Functional Reactive Programming
Functional Reactive Programming integrates time flow and compositional events into functional programming. This provides an elegant way to express computation in domains such as interactive animations, robotics, computer vision, user interfaces, and simulation.
The following libraries are implementations of FRP:
From www.haskell.org/frp/, last updated 2003
This is a copy of the obsolete /frp/, added so a link from http://en.wikipedia.org/wiki/Functional_reactive_programming could be losslessly repointed from there to here.