Predator: Concrete Jungle is a 2005 title with a lot of ties to the Alien franchise - here's every reference found in the game. The simple but ingenious hook of 1987's Predator found an alien coming to Earth to hunt the ultimate game - man. This particular hunter didn't bank on running into Arnold Schwarzenegger's commando Dutch, however, who eventually levels the playing field and beats the monster in a brutal fight. The original design of the Predator, initially played by an unknown Jean-Claude Van Damme, was famously a disaster, but Stan Winston later came on board to design a new creature that became iconic.
The success of the original movie soon found Predator becoming a full-on franchise, spawning sequels, comic books, and video games. Predator 2 famously featured an easter egg nod to the Alien series, with the skull of a Xenomorph seen struck on the trophy wall. This teased an impending movie crossover between the two franchises that took a full 14 years to come to fruition with 2004's Alien Vs Predator. The two species have duked it out in video games and comics too, and an alternate ending to Shane Black's The Predator would have introduced Ellen Ripley to the franchise.
Predator: Concrete Jungle was the title of the first Predator comic series, which found Dutch's brother Detective Schaefer facing off with a new hunter in New York. This 1989 comic would prove to be an inspiration on Predator 2, which borrowed a number of ideas and setpieces like the subway attack. Predator: Concrete Jungle later became the title of a video game for the PlayStation 2 and Xbox, which found a disgraced Predator looking to reclaim his honor by undertaking a dangerous hunt in a futuristic city. The game also features a number of direct links to the Alien franchise.
While the gameplay of Predator: Concrete Jungle is somewhat clunky, it features a surprisingly involving story, with the title hunter Scarface making for a cool protagonist. While the game isn't technically a crossover, the Alien franchise looms large in the background. The game namedrops Charles Weyland (Lance Henriksen) from 2004's Alien Vs Predator, who was killed by a Predator during an expedition. The computer running the city is called MOTHER, a clear reference to the Nostromo's central computer in Alien, and the ending features a Weyland descendant discussing the recent merger between Weyland - Yutani.
The most direct link between Predator: Concrete Jungle and Alien is the surprise appearance of the Xenomorphs themselves. Late in the game, Scarface is lured into a Xenomorph nest and he has to fight his way through the hordes. It's a short section, but since the game hadn't advertised their appearance, it was a nice surprise to see them show up. Scarface can also acquire a Plasmacaster made from a Xenomorph skull.
While its unlikely Predator: Concrete Jungle had any influence on The Predator, the end boss is a human/Predator hybrid, and hybridization is a major subplot found in Shane Black's sequel.