I'm thinking of updating my self-published “Getting Started” book on AOO and making it available to the community in free PDF and low-cost printed copy, whether you choose to link to it or publicise it in any way. It could be dual-licensed CC-BY & GPL, but not A2.
The v3.4 version of this book began in the ODFAuthors group, but after AOO rejected it, I completed it and published it under my own name in 2013. It doesn’t cover the full range of topics as for the old OOo book, but IMO a “Getting Started” book doesn’t need to do that. Jean
