Has anyone used InDesign? Has anyone used any alternatives?

I want to make some mailers for my business, but it's just not something I'm going to be doing often. I don't want to sign up for a monthly fee for a product I'm only going to use once every 2-6 months. Are there any alternatives? I've looked at Alternativeto.net, but nothing there seemed very good...

Is InDesign even the best tool for this? Will I be able to train myself how to use it? There's a free trial, at least, so I might be able to make what I need to right now, but it'll be annoying to create accounts every once and a while to keep getting additional trials...