Someone asked about the technology that runs this site. In one word: WordPress. That’s right. Anyone with ideas working in a garage could create a blog.
The images are most of the time (>95%) made in Open Office Draw. It is amazing how much one can do with open source software.
In March 2019 I switched to Libre Office. It is an office suite very similar to Open Office.
There are some image that look cartoonized. That’s an Open CV filter that takes a photography and converts it into something looking more like a toon.