Mac OS X Softwares to Sci-fi Setting

Alien Arena is a fast-paced, free-to-play deathmatch style first-person shooter set in a futuristic, science-fiction universe. It emphasizes classic arena combat with a variety of weapons, maps, and game modes, offering both online multiplayer and single-player bot matches for intense action.

Tremulous is a unique free and open source team-based first-person shooter that seamlessly blends FPS action with real-time strategy elements. Players join one of two opposing teams, Humans or Aliens, each with distinct capabilities and objectives, engaging in fast-paced combat while managing resources and building structures to gain an advantage.

Alien Swarm is a free-to-play, top-down cooperative shooter developed by Valve. Players control a squad of marines battling hordes of extraterrestrial enemies in various sci-fi environments, emphasizing teamwork and tactical gameplay.

Nexuiz Classic is a fast-paced, free and open-source arena first-person shooter that delivers intense multiplayer combat with a focus on classic deathmatch gameplay and a wide array of futuristic weaponry.

Borderlands is a critically acclaimed action role-playing first-person shooter series known for its unique cell-shaded art style, over-the-top humor, and procedurally generated loot system.

OpenArena is a free and open-source standalone 3D first-person shooter game. It is a community-developed clone of Quake III Arena, offering fast-paced multiplayer and single-player combat with a variety of weapons and game modes.

Xonotic is a fast-paced, arena-style first-person shooter with a focus on pure competitive gameplay. It is free, open-source, and offers both single-player and robust multiplayer modes with a variety of weapons and game types.

StarCraft is a critically acclaimed real-time strategy game series that launched the esports scene, set in a deep science fiction universe involving three distinct species: Terran, Zerg, and Protoss, locked in a galactic war for survival and dominance.

Unreal Tournament is a classic arena first-person shooter series emphasizing fast-paced multiplayer combat. Known for its intense gameplay, diverse weaponry, and iconic maps, it offers a pure and adrenaline-fueled gaming experience in both online and offline modes.