Little spoiler: if all goes well, before the end of the year, there will be an illustrated read-aloud book "Ada & Zangemann - a fairy tale about software, skateboards, and ice cream" for children from ~5-6 years old about Free Software. The book will first be available in German, but I am already working on an English version and maybe assist in other translations in future.
In the book there will be a link to a website with further information about Free Software and an important component of this will be the wiki page "How can children learn programming".
The wiki page is at the moment just a first frame. Please help to expand it, so that parents whose children are interested in programming can get some help with resources that don't teach it with non-free software. Thank you!