Alive GUI library with FRP support for Haskell
animation, frp, haskell, user-interface
Solution
Reactive Banana has been updated relatively regularly, has bindings to SDL, some decent examples, a tutorial and a relatively small but decently commented API reference.
There's also a backend to wx, and see this question about using it with GtK.
The maintainer, Heinrich Apfelmus, is on Stack Overflow, and often answers questions on the reactive-banana tag.
Does this suit your needs?
Problem
Is there any alive Haskell library which implements FRP and could be used to program UI/interactive graphics? What I expect from such a library: - Doesn't use any crazy GHC extension, so code could be understood by mortals. - Not abandoned (had some commits in last 6 mouths and few answered thread in mailing lists). - Backed by some modern window library (Qt, GTK) and covers fair amount of it functionality. - Also has drawing and animation support, i.e. let the user to simply define some shapes and effects and bind their parameters to behaviors. I checked some resources and picture is quite sad. - Original Fran and its ancestor Fruit family are officially dead. - Reactive is an abstract framework and doesn't have bindings to real UI/graphics (did I miss something?). - Netwire also look aimed for general case. Currently it has no documentation covering how to build UI/graphics with it. The only example is a full application not even close to tutorial. - Grapefruit looks good, but it had last commits in December 2013 and the mailing list full of spam. I consider it abandoned. - Yampa has not documentation at all, and the mailing list is silent since November 2013.