[RussianCow]

It's also quite easy to roll your own solution. I used to do this before I heard about Redux, and the whole library was ~100 lines I think (not including tests). My implementation exposed a store and allowed you to subscribe to "events" on it (postAdded, etc). It ended up working similarly to Redux, but without the reducers (you would just handle the event in-place).

That said, these days I would never use anything but Redux. MobX is gaining traction as a viable alternative, but I just love having all possible mutations spelled out explicitly.