WP Rocket - WP Rocket offers a caching plugin for Wordpress.
Apache Tika - Apache Tika toolkit detects and extracts metadata and text from different file types.
Autoptimize - Autoptimize makes optimizing your site really easy.
code-prettify - Code Prettify is an embeddable script that makes source-code snippets in HTML prettier.
WP Super Cache - A very fast caching system for WordPress that produces static HTML files.
highlight.js - Highlight.js is a syntax highlighter written in JavaScript. It works in the browser as well as on the server.