Does anyone know of Groovy being used as the primary language for a significant codebase outside of some other language or framework? Every use I've seen of it involves helping along Grails web artifacts or existing Java classes. And most uses of Groovy in Github are as the language for a sole Gradle build script, to build a project written in another language. You'd be taking a big chance using Groovy as the primary language to build something if there's no known track record elsewhere for this use.