“Prism is a Sketch plugin that helps you create beautiful palettes based on your document colors and export them using various formats. (hex/rgba/UIColor, etc). It creates an artboard color palette with all your ‘Document Colors’ and their respective color label in a variety of formats. It’s super useful when working with developers and fully customizable, you can export your palettes with the information and the design you want…”

While this may overlap with other plugins like Craft and Sketch Palettes, the customization & nicknaming (“alias”) features may be compelling for some use cases.