The adverts in the blog are as much an experiment as the software itself!
I'm intrigued to see how much 'revenue' a Google AdSense can bring to a small niche blog. Likewise I've registered for Amazon Associates. The site isn't costing me anything (except time) so doesn't need to make money. But I've been advertising through Google Ads in my day job for sometime, and wondered how the experience is on the other side. Amazon Associates - seems logical since I will from time-to-time mention books here anyway.