Hello Patrick,

Welcome to the forums, I have found you can use Scribus as an alternative to InDesign. Tap or click here, and here is a tidbit from their site.

Why on earth should I use Scribus?

Because it’s reliable and Free. Free really means Free with an uppercase F. Free is more than just gratis (which is just a side-effect). It means that you are in control of your data and, if you wish, the code of your desktop publishing tool. That’s what smart individuals and companies prefer

Then for an alternative to Illustrator, I can recommend either Inkscape or Boxy-svg.com which oddly enough is a Google Chrome extension, both Free applications.