Slice Machine is a workflow tool developed by Prismic that aims to improve component-based approach in website development. It's an open-source CLI and a component library designed to help developers build, deploy, and manage website sections more efficiently. The tool provides a visual interface for non-technical users to create pages by combining pre-built components, called Slices. Slice Machine also includes features like accessibility, responsiveness, and cross-browser compatibility in its default library of customizable components. The project is currently in the beta testing phase and encourages community involvement through open-source contributions and feedback.