The JetBrains Kotlin webpage http://confluence.jetbrains.com/display/Kotlin/Welcome http://confluence.jetbrains.com/display/Kotlin/Welcome still shows Kotlin as

The JetBrains Kotlin webpage http://confluence.jetbrains.com/display/Kotlin/Welcome http://confluence.jetbrains.com/display/Kotlin/Welcome still shows Kotlin as active. It's certainly better known than any of those other languages you mentioned. In fact, the two greatest innovators on the Groovy language, James Strachan (original creator of Groovy), and Alex Tkachman (original creator of Groovy's static mode), were "encouraged" to move on from Groovy by its present leadership, and are both now contributors to Kotlin.