Opera is fast secure and easy to use. It could be used in PC, Mobile and devices. The browser is free but the SDK and its addons are <A HREF="http://dev.opera.com/" target="_blank">open source BSD license.</A>. Its features include:
 <UL>
 <LI>Opera Turbo for fast browsing on slow connections</LI>
	<LI>Opera Unite is a technology platform allowing you to share content directly with friends </LI>
	<LI>Opera Mail - Integrated email client</LI>
	<LI>Visual tabs and sleek design</LI>
	<LI>Integrated Web search</LI>
	<LI>Customize your browser</LI>
	<LI>Smarter address field</LI>
	<LI>Content blocking</LI>
	<LI>Download Manager with BitTorrent</LI>
	<LI>New private browsing</LI>
	<LI>Encryption</LI>
	<LI>Cookie control</LI>
	<LI>New Vega graphics library</LI>
	<LI>Introducing Carakan, the fastest JavaScript engine ever</LI>
 </UL>

Opera is fast secure and easy to use. It could be used in PC, Mobile and devices. The browser is free but the SDK and its addons are <A HREF="http://dev.opera.com/" target="_blank">open source BSD license.</A>

Opera

Flying Saucer takes XML or XHTML and applies CSS 2.1-compliant stylesheets to it, in order to render to PDF (via iText), images, and on-screen using Swing or SWT. The library implements (basically) the entirety of CSS 2.1 and aims to be fully compliant with the W3C specification; it includes a small handful of CSS 3 features. 



Flying Saucer - XML/XHTML and CSS 2.1 renderer in pure Java

Servo is a modern, high-performance browser engine designed for both application and embedded use. It aims to achieve better parallelism, security, modularity, and performance. 


Servo - Parallel Browser Engine used in Firefox

Opaque is faster, more secure, and user friendly web browser. It is built for speed. Opaque tries to make the most of your Internet connection to provide you with fast page loads and downloads.

Opaque - Web Browser

Pale Moon is an Open Source, Goanna-based web browser available for Microsoft Windows and Linux (with other operating systems in development), focusing on efficiency and customization. Make sure to get the most out of your browser.
 
 Pale Moon offers you a browsing experience in a browser completely built from its own, independently developed source that has been forked off from Firefox/Mozilla code a number of years ago, with carefully selected features and optimizations to improve the browser's stability and user experience, while offering full customization and a growing collection of extensions and themes to make the browser truly your own.
<ul>
 <li>Optimized for modern processors</li>
 <li>Based on our own optimized layout engine (Goanna) 
 </li>
 <li>Safe: forked from mature Mozilla code and regularly updated</li>
 <li>Secure: Additional security features and security-aware
development 
 </li>
 <li>Supported by our user community, and fully non-profit 
 </li>
 <li>Familiar, efficient, fully customizable interface </li>
 <li>Support for full themes: total freedom over any element's
design </li>
 <li>Support for easily-created lightweight themes (skins) 
 </li>
 <li>Smooth and speedy page drawing and script processing </li>
 <li>Increased stability: experience fewer browser crashes 
 </li>
 <li>Support for many Firefox extensions 
 </li>
 <li>Support for a growing number of Pale Moon exclusive
extensions 
 </li>
 <li>Extensive and growing support for HTML5 and CSS3</li>
 <li>Broad support for image formats: Supports WebP and JPEG-XR 
 </li>
 <li>Many customization and configuration options 
 </li>
 </ul>

 Pale Moon is an Open Source, Goanna-based web browser available for Microsoft Windows and Linux (with other operating systems in development), focusing on efficiency and customization. Make sure to get the most out of your browser.

Pale Moon - Goanna-based web browser

 A keyboard-driven, vim-like browser based on PyQt5 and Qt. qutebrowser is a keyboard-focused browser with a minimal GUI. It’s based on Python and PyQt5 and free software, licensed under the GPL.

qutebrowser - A keyboard-driven, vim-like browser based on PyQt5.

GNOME Web (codename: Epiphany) is a GNOME web browser based on the WebKit rendering engine. The codename means "a usually sudden manifestation or perception of the essential nature or meaning of something" (Merriam-Webster). Epiphany is opinionated.

Epiphany - A simple, clean, beautiful view of the Web

A cross-browser implementation of the AudioContext which aims to closely follow the standard. This package provides a subset of the Web Audio API which works in a reliable and consistent way in every supported browser. In contrast to other popular polyfills standardized-audio-context does not patch or modify anything on the global scope. In other words, it does not cause any side effects. It can therefore be used safely inside of libraries.

standardized-audio-context - A cross-browser implementation of the AudioContext which aims to closely follow the standard

 This is a (Firefox) Web Extension, which makes it possible to generate a QR code from any website. In contrast to many other add-ons, which use Google Web APIs for that, this add-on works completely offline. This QR code generator puts your privacy first! Effectively, the add-on prevents any web connection for itself, so it does never contact the web. Thanks to the linked manifest.json you can also easily verify, that this claim is true. It works offline! Always.

Offline-qr-code - Offline QR Code Generator

Pixels.JS is an image filtering library with over 70 photo filters for use in the browser or with Node.JS. Image filtering comprises vintage filters, solarizers, inverters, and over ninety more. You can explore these in the Flashback web app, which makes use of the library.

Pixels.JS - An image filtering library, containing over 70 image filters for use in-browser and with Node

Screensy is a simple screen sharing solution. It consists of two parts, the rendezvous part which runs on the server, and the website part which runs in the user's browser. The rendezvous server is only used for protocol negotiation and discovery of viewers. The video stream is directly sent from the browser of the broadcaster to the browser of each
viewer. All traffic (between rendezvous and browser and between browsers) is encrypted by default.

Screensy -  Simple peer-to-peer screen sharing 

gngr is an independent implementation of web standards in pure Java. It is not a wrapper around other browser engines. gngr plans to protect privacy by disabling Cookies, Javascript, XHR requests and providing fine granuality of control over them. 

gngr - A cross-platform browser focussed on privacy

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