I've been using the Kindle ebook reader for over a decade now, and I've accumulated quite a big digital library from Amazon. However, now I'd like to move away to another ebook reader, preferably Kobo, but I don't want to leave my Kindle ebooks behind. I'd like to bring them with me.

Does anyone have any advices or tools that they can recommend that will allow me to move my Kindle ebooks over to Kobo or some other ebook reader (e.g. Nook)?

P.S. Sorry if this post has nothing to do with this community. Out of all the communities I follow, this one seemed to be the most appropriate for such a question.