Reactive Streams Implementations Trends (Akka, RxJava, Vert.x, Spring Reactor)

Google trends showing popularity of Reactive Streams Implementations below:

https://trends.google.com/trends/explore?geo=US&q=%2Fm%2F0wx_061,%2Fm%2F0ndx2mr,spring%20reactor,rxjava

1. Akka

2. RxJava

3. Vert.x

4. Spring Reactor

See also : https://en.wikipedia.org/wiki/Reactive_Streams