“Free software” means software that respects users' freedom and community. Roughly, it means that the users have the freedom to run, copy, distribute, study, change and improve the software. Thus, “free software” is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech,” not as in “free beer.” We sometimes call it “libre software,” borrowing the French or Spanish word for “free” as in freedom, to show we do not mean the software is gratis.
You may have paid money to get copies of a free program, or you may have obtained copies at no charge. But regardless of how you got your copies, you always have the freedom to copy and change the software, even to sell copies.

More about Free Software...

Dealing with text, text styling and the making and publishing of printed books.
And the associated Libre software tools.
With some examples.

PDF presentation

The various types of 2D pictures, raster images and vector images
And the Libre software tools for manipulating images.
With some examples.

PDF presentation

About HTML, Web pages and Websites

PDF presentation

Building a web site without knowing HTML just with a text editor that produce pdf files, and some basic knowledge of hypertext links

PDF presentation

Some Libre software video editing tools

PDF text document

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Models, Scenes, Worlds, Displaying 3D in HTML pages on the Web...
3D Computer graphics. Ideas, Standards and Tools

PDF text document

Reasons why Digital Surrealism does not exist and numerous examples of its non existence

PDF presentation