Free downloads in all formats: Light Wizzard
http://LightWizzard.com/
Trinary University
http://TrinaryUniversity.org/
Operating System and Tools
Arch Linux Manjaro, Gedit: book is in XHTML, Qt, Bash: bc, sed, grep, and other Linux applications.
1 Document to Rule them All 3
1 Document to Rule them All 3
Author: Jeffrey Scott Flesher
1 Document to Rule them All 3
http://TrinaryUniversity.org/books/1-document-2-rule-them-all-3/book/oebps/1-document-2-rule-them-all-3-kindle-ebook-pdf-web-page.html
GIMP
GIMP
https://Gimp.org
GIMP is a Cross-Platform image editor available for GNU/Linux, OS X, Windows, and more operating systems. It is free software, you can change its source code and distribute your changes.
Whether you are a graphic designer, photographer, illustrator, or scientist, GIMP provides you with sophisticated tools to get your job done. You can further enhance your productivity with GIMP thanks to many customization options and 3rd party plugins.
Blender
Blender
https://Blender.org/
Blender is the free and Open Source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation.
MathJax
MathJax
https://MathJax.org/
Beautiful math in all browsers. A JavaScript display engine for mathematics that works in all browsers. No more setup for readers. It just works. I used it, took screen shots, then used the images, due to all the formats I must support.