DTP being Desk Top Publishing. Maybe this could go in Writing Resources but it's probably better here. Anyway, I've played about with varied programs for this over the years, some advertised as DTP, others (like Corel Draw) being graphics programs, and some lowly word processors. Of the latter, OpenOffice/LibreOffice Writer is the only one I consider adequate for interior book design/typesetting, having been designed from the ground up (or code up, I guess is more accurate) as much like a DTP app as a word processing one. I've used it a fair amount for the relatively simple design of most of my books. So, along comes Affinity Publisher for Serif. Supposedly it has most of the functionality of InDesign at a way lower cost—and right now it's at half-price, plus there is a 90 day free trial. At that lower price, which comes to $25, it might be smart for me to purchase it, even if I don't strictly need it ! I'm fooling around with the trial right now. There is a learning curve and I may not be willing to stick with it, but we'll see. Incidentally, Serif used to have a publishing program called PagePlus that wasn't bad, but not really ideal for longer books. This is a completely new and different program. This is just intended as a heads-up for anyone interested in DIY book design—and doesn't want to pay Adobe twenty bucks a month.