Here are some of the examples of Reactive Programming libraries I've found in Purescript and what I've thought about them so far:
Purescript Behaviors: https://github.com/paf31/purescript-behaviors
I've never used a library with truly continuous Behaviors, so this was really neat to try out for me. Really nice to use and comes with utilities for working with browser events already, and gives you good Event modules for picking your sampling options as necessary.
I will probably use this library for all of my future uses.