Ant.designToolEnterprise-class UI design language and React components Stars98.5K Forks54.6K Last commitJun 30, 2026StartupToolbox·Jun 30, 2026Ant Design is an open-source enterprise-class UI design language and React component library offering a large set of high-quality, ready-to-use components and design resources. It is backed by Alibaba's Ant Group.Alternative toMUMaterial UI|CUChakra UI|MMantine
BootstrapToolThe world's most popular HTML, CSS and JS library PricingFree tier DeploymentSelf Hosted APIAvailableStartupToolbox·Jun 30, 2026Bootstrap is an open-source frontend toolkit for building responsive, mobile-first websites with a prebuilt grid system, UI components, and JavaScript plugins. It is customizable via Sass and CSS variables.Alternative toTCTailwind CSS|FFoundation|MMaterialize
BulmaToolFree, open source, modern CSS framework Stars50.1K Forks3.9K Last commitMar 1, 2026StartupToolbox·Jun 30, 2026Bulma is a free, open source CSS framework based on Flexbox that provides ready-to-use responsive components for building web interfaces without writing custom CSS.Alternative toBootstrap|TCTailwind CSS|FFoundation