Here is exercise 14.23

What is the software package you use to write your attached PDF file stuff?

I use MikTeX combined with the Eclipse editor/IDE. You can download all of this for free. It may be a bit tricky to set up if you haven't used it before, but it's really good once you have it working and you are comfortable with LaTeX.

If you don't want to bother with configuring MikTeX and Eclipse, there are also online LaTeX deployments that can output PDF and/or image files. For example: ScienceSoft.at and Latex-Online-Compiler. Some other online LaTeX resources are available at Wordpress.