Mermaid : Mermaid is a Javascript based diagramming and charting tool that uses Markdown-inspired text definitions and a renderer to create and modify complex d...
RegPack : RegPack is a packer intended for use on minified Javascript code.
It is mostly suited to small size constraints (1kb, up to 4kb).
Cypress : JavaScript End to End Testing Framework. Fast, easy and reliable testing for anything that runs in a browser.
Flow : Adds static typing to JavaScript to improve developer productivity and code quality.