This is very old news. It was pointed out by one of the readers of this blog in 2011 already that the Windows version is free. It is a competitor for Zim and Tomboy. It's a simple wiki, best used for light work, I would think. It's no competition for ConnectedText.
One thing I don't like is that you create links by surround words or phrases with a set of curly brackets rather than with sets of two square brackets. One thing I like is that it saves the wiki pages as text files.
1. See here (in the comments).