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