Grunt-spritesmith

Supports multiple packing algorithms like binary-tree and diagonal, optimizing sprite arrangement to minimize wasted space, as demonstrated with visual examples in the README.

Automatically generates separate spritesheets and CSS for high-DPI displays using @2x suffixes, handling normal and retina images seamlessly with configurable parameters.

Outputs CSS in various preprocessor formats (Sass, Less, Stylus) and allows custom templates via Handlebars or JavaScript functions, enabling highly tailored CSS generation.

Works with multiple image processing engines like pixelsmith (Node.js) and gmsmith (GraphicsMagick), offering trade-offs in performance and format support as detailed in the Engines section.