gulp-rigger is a Gulp plugin that acts as a build-time include engine for JavaScript, CSS, CoffeeScript, and other text files, allowing developers to "include" or import other files during the build process. It is designed for developers working with Gulp-based build systems who want to modularize their code and manage dependencies more efficiently. The tool is particularly useful for front-end developers and those working with JavaScript projects that require file concatenation or modular code organization.