WeasyPrint is a visual rendering engine for HTML and CSS that can export to PDF. It aims to support web standards for printing.
Well designed website to get unicode values and other codes for special characters
If you need to convert files from one markup format into another, pandoc is your swiss-army knife.
The Atom Shell framework lets you write cross-platform desktop applications using JavaScript, HTML and CSS.
It is based on node.js and Chromium and is used in the Atom editor.
A real-time, node-based video effects compositor for the web built with HTML5, Javascript and WebGL
Two.js is a two-dimensional drawing api geared towards modern web browsers. It is renderer agnostic enabling the same api to draw in multiple contexts: svg, canvas, and webgl.
Tempo is a tiny JSON rendering engine that enables you to craft data templates in pure HTML.