butterchurn - Butterchurn is a WebGL implementation of the Milkdrop Visualizer
jq - jq is a lightweight and flexible command-line JSON processor.
DOMPurify - DOMPurify - a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMPurify works with a secure default, but offers a lot of configurability and hooks. Demo: https://cure53.de/purify