com.fireflysource:firefly-kotlin-ext (maven):  Firefly framework helps you create a java web application easy and quickly. It provides MVC framework with HTTP Server and many other useful components for developing web applications. It means you can easy deploy your web without any other java web containers, in short , it's containerless. It taps into the fullest potential of hardware using SEDA architecture, a highly customizable thread model. 
Keywords: asynchronous|high-performance|http|http-client|http-server|http2|kotlin|oauth2|reactive|reactive-programming|tcp|tls|web|web-framework|websocket