Description: Write and run code with instant live feedback.

Description: Codapi is a platform for embedding interactive code snippets directly into your product documentation, online course or blog post.
Codapi manages sandboxes (isolated execution environments) and provides an API to execute code in these sandboxes. It also provides a JavaScript widget codapi-js for easier integration.

Source: https://github.com/nalgeon/codapi

Description: The most fun place to experiment with layouts using variable fonts, and export front-end code right from this little web app. Designed and developed by Wenting Zhang.

Description: An interactive JavaScript sandbox. This project provides a quick, visual way to experiment with JavaScript code. It's designed to be loaded as an iframe for easy inclusion in any webpage.
There are a variety of configuration options, including a React preset and a React Native preset.