Lightning fast web authoring library targeted at creating web components with data binding, repeaters and more features. http://slimjs.com.
Cost / License
- Free
- Open Source
Platforms
- Mac
- Windows
- Linux
Lego is described as 'Web-components library made lightweight and Future-proof' and is an app. There are more than 25 alternatives to Lego for a variety of platforms, including Windows, Linux, Self-Hosted, Mac and Web-based apps. The best Lego alternative is Vue.js, which is both free and Open Source. Other great apps like Lego are Angular, React, Svelte and Vite.
Lightning fast web authoring library targeted at creating web components with data binding, repeaters and more features. http://slimjs.com.
A TypeScript/JavaScript library for quickly building performant declarative user interfaces without the use of a virtual DOM.

With more than 80 UI components, including advanced tables, charts, and forms, this open-source JavaScript framework will help you build complex, data-rich web applications faster and more efficiently.
Rax is a universal JavaScript library built and used by Alibaba.com that has a largely React compatible API.