@jamiebuilds was sick of all the ceremony around state management in React, so he built Unstated.
Unstated isn't ambitious, use it as you need it, it's nice and small for that reason. Don't think of it as a "Redux killer". Don't go trying to build complex tools on top of it. Don't reinvent the wheel. Just try it out and see how you like it.
It's been getting some praise on the Twitters. Sindre Sorhus says:
Unstated is a breath of fresh air for state management. I rewrote my whole app to use it yesterday.