I don't play shooters, but I do frequently visit some of my favorite streamers who play shooters. One game that I really enjoyed watching was the Bioshock series. The story was really good, and I highly recommend it, given it's 80% off for the entire series on Steam, definitely check it out. Source: over 2 years ago

Although I don't play shooters, I've watched a streamer play the entire Bioshock series in the past and the story was amazing. You play as Jack, the protagonist of the game where he got into a plane crash while flying over the Atlantic Ocean. Being the only survivor, he discovers an underwater city, and then asked to help stop the leader of the city. I definitely recommend for a single player. Source: over 2 years ago

Apache Karaf with OSGi works pretty nice using annotation based dependency injection with the declarative services, removing the need to mess with those hopefully archaic XML blueprints. Too bad it's not as trendy as spring and the developers so many of the tutorials can be a bit dated and hard to find. Karaf also supports many other frameworks and programming models as well and there's even Red Hat supported... Source: about 3 years ago