I've actually been looking for something that goes the other way. The main issue i've had with Tether and React is that Tether does too much. I don't want a lib that manipulates the DOM itself, I want a overlay positioning engine that I can use to position an element (much like Popper and Tether), but that leaves the positioning up to me (ie let React keep full control of the DOM). Obviously i'd need to subscribe to position updates too, for scroll and resize (and any other) events. I tried to do this using Tether as a starting point, but it was a painful experience trying to to untangle its code.

When I talk about engines, I mean things like Zynga's Scroller (https://github.com/zynga/scroller), essentially a purely logical set of functionality that doesn't assume a particular view-level implementation.