Every month they offer a selection of usually boring and lame books (at least for my tastes) that you can add to your library for free if you add it during the month, but this month this book popped out at me immediately. They have some other original production Aliens universe books which are produced like a movie complete with sound effects which are great as well. I have only listened to Out of the Shadows (which was another free book one month a couple of years ago or so) but the rest have good reviews as well. The book is added to your library once you "purchase" it for free.
https://www.audible.com/pd/Alien-III-Audiobook/B07QY3KR81I personally have become addicted to audio books in the past year and a half and go through 2-3 a month while working and driving.
Also I think titles on the forum could use a character limit increase.