AvatarJS

From APIDesign

AvatarJS was an attempt to re-implement NodeJS on top of the JVM. These days just download GraalVM and you'll get JavaScript and Java for free. Compatibility is guaranteed.

Tooling

The NetBeans tooling (including excellent debugging, see Nashorn).

Speed

GraalVM includes as fast as V8 implementation of JavaScript. Predicted presentation about next generation Nashorn many years ago...