The best alternatives to Reactime are GitBook, Atomize React, and React Proto. If these 3 options don't work for you, we've listed a few more alternatives below.
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GitBook began in mid-2014 as an open-source tool for developers to build documentation. Today we empower teams of all sizes to share knowledge and build great internal & external docs.
Atomize React is a UI framework that helps developers collaborate with designers and build consistent user interfaces effortlessly. It is based on Atomize design system for Sketch. Website: https://atomizecode.com/
React Proto aims to give developers and designers the tools necessary for creating clean, organized, and intentional code from the beginning of the development process. Defining your components, their hierarchy, and how they interact via state and props, can alleviate the need for refactoring, and unnecessary code as your application scales.
React Native is a developer tool that builds mobile UI from declarative components. You can use only JavaScript and React to build a real app, with User Interface fundamental blocks, like the ones for iOS and Android. You can forget about the recompiling with Hot reloading feature.