The best alternatives to Belle are Carrd, Atomize by Quarkly, and MD Bootstrap. If these 3 options don't work for you, we've listed a few more alternatives below.
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Atomize is the basis for Quarkly.io components. Atomize allows you to set styles for a specific component depending on a breakpoint, configure their states, add variables from the theme, transfer the desired props to a special panel (Props tab), and more.
MDBootstrap stands for material design for bootstrap. Or in simple word, a version of bootstrap that inspired with Material Designs. MDBootstrap have hundreds of beautiful components, templates, animations, effects and helpers. Everything fully responsive, compatible with different browsers and it is easy to use.
React Rainbow is a collection of components that will reliably help you build your web application in a snap. - 60+ components - Proper documentation based on Interactive Examples - Open-source project - TypeScript support - Theme and more...