highlight.js - Highlight.js is a syntax highlighter written in JavaScript. It works in the browser as well as on the server.
Sass - Syntatically Awesome Style Sheets
code-prettify - Code Prettify is an embeddable script that makes source-code snippets in HTML prettier.
PostCSS - Increase code readability. Add vendor prefixes to CSS rules using values from Can I Use. Autoprefixer will use the data based on current browser popularity and property support to apply prefixes for you.
Apache Tika - Apache Tika toolkit detects and extracts metadata and text from different file types.
Stylus - EXPRESSIVE, DYNAMIC, ROBUST CSS