Galaxy of Terror, Mutant (NSFW), Contamination and the joy of cheap alien knockoffs. Prefer the sequel? Here's Aliens remade under the name "Terminator 2". Sadly one take on the franchise that will not be seeing the light of day is Alien Identity, a fan film recently shut down by a cease and desist from Fox. Meanwhile the Neil Blomkamp Alien film continues to incubate.
Giger's Necronomicon (yt) (nsfw) - a 1976 documentary about H.R. Giger with music by Joel Vandroogenbroeck of the Brainticket.
“When Jim first came to me with this idea of putting two guys inside a giant alien queen suit,” Winston admitted, “I thought, ‘This man is out of his mind.’ Nothing like that had been done before. But in the next moment, I realized that if he had imagined it, we could probably do it.” - How Stan Winston and Jim Cameron built the Alien Queen. Original creature creature H.R. Giger was disapointed not to be involved, leading to this letter from Cameron.
Chris Foss concept art for Dune, with bonus Nostromo. The images were produced for Alejandro Jodorowsky's 1974 attempt at filming the story, with other artists involved including Moebius and HR Giger. Though the project failed Jodorowsky collaborated further with Moebius to lay the groundwork for his own Dune-like comicbook universe (and a trailer for an animated version of it was even created). More visions of Arrakis can be seen on this page of Dune cover artwork through the ages, with bonus midi Toto.