CSS frameworks have evolved over the years, offering developers various tools to enhance design and functionality with options ranging from classic frameworks like Bootstrap, which provides responsive, mobile-first design templates, to newer, utility-first frameworks such as Tailwind CSS. Developers often evaluate these frameworks based on metrics like GitHub stars, weekly NPM downloads, and the frequency of updates, which can reflect a project's popularity and relevance. Bootstrap remains a popular choice due to its stability and comprehensive UI components, while Tailwind CSS attracts those who prefer a modern, utility-based approach. For developers working with JavaScript component frameworks like React, CSS-in-JS libraries such as styled-components and Emotion offer programmatic style manipulation, although newer options like Stitches and vanilla-extract are gaining interest for their small bundle sizes and type-safe features. Ultimately, the choice of a CSS framework depends on the specific needs of a project, the desired level of customization, and the integration requirements with other technologies, with developers often opting for Bootstrap, Tailwind CSS, or styled-components as reliable starting points.