Games similar to Alien Swarm include Doom. It's paid, but Digital Paint: Paintball 2 is free. Other options are Shadow Warrior (Reboot), Prodeus, Dead Space and HELLDIVERS. You can choose from more than 10 First-Person Shooters like Alien Swarm for Windows, Linux, Mac, the web and Android.
Jake2 is a Java 3D game engine. It is a port of the GPL’d Quake2 game engine from id Software. To use the Jake2 engine you need either the data files from the original game or from the demo version that is available for download from ftp://ftp.idsoftware.com.
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Nightmare Creatures is a survival horror video game released for the PlayStation and PC in 1997, and Nintendo 64 in 1998 as a North America exclusive. It was developed by Kalisto Entertainment and published by Activision.
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Xenowerk is a top-down action shooter challenging your combat skills in an underground science lab. Descend deeper into the abyss and explore the tarnished levels. Armed with a flashlight as your main guidance, you’ll never know what’s lurking in the dark!
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Wrack: Exoverse is the follow-up to the 2014 first-person shooter Wrack. It was a very fast-paced, arcade-style game with heavy influences from classic shooters like Doom and Quake.
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