A tutorial is a method of transferring knowledge and may be used as a part of a learning process. More interactive and specific than a book or a lecture; a tutorial seeks to teach by example and supply the information to complete a certain task.
Tutorial
What is PNGQuant? PNGQuant is a free to use, open source (available under a BSD-like license) command line utility and library for converting PNG... Annotator.js is an open-source (available on GitHub) JavaScript library created by the Open Knowledge Foundation that allows you to add annotations to web pages.... PDF stands for portable document format and is the world’s most popular file format. So it’s likely to be one that Java Developers need... 
