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: PHP Sandbox is an online code sandbox for PHP that makes prototyping and sharing of PHP projects swift and painless!

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.