There are plenty of Alien novels (though none as good as the movie). One even has a lost episode of Ripley waking up between going to sleep and being found by deep space salvagers. There's also a William Gibson treatment of a script for the 3rd movie that was re-published maybe last year. Other than that I would recommend the closest thing being cosmic horror (Annihilation, Lovecraft), and space opera (Iain M. Banks Culture series).