Is there any microservice framework, other than Spring? And for reactive programming?

#ktor ?

https://ratpack.io/ - if you want lightweight They have nice example in Kotlin: https://github.com/ratpack/example-ratpack-gradle-kotlin-app

http://ktor.io is even developed by JetBrains

Dropwizard, Ktor, Javelin, Http4k, Spark, Play…