Right now I use React and Javascript mainly. I use redux for the very core parts of my app that load data from the server. I tend to be pretty minimal so after that, it's highly dependent on the app and it's needs and I usually write custom libraries for it, or pick something if it's already good enough.
I've always loved Clojure(Script) but haven't had the chance to work on a project in it yet. And recently Reason has me interested and with all the React support coming out for it that is likely to be my next language of choice.