Toolstrap is a front-end framework for building Groupon internal tools. It aims to solve common problems like developers spending too much time on CSS instead of features, and inconsistency in branding and designs across apps. Toolstrap provides pre-built layouts, components, modules and styles based on frameworks like Bootstrap and Foundation to standardize the look and speed up development. It includes a custom Groupon icon font and styles for popular UI libraries that can be compiled into a single CSS/JS file for use.