Tactigamer

Another incredible looking map that you can play on Insurgency: Sandstorm. Not to mention - incredibly difficult. Stay low.
Author: deerslug

This mod simply allows you to set a keybind so that you are able to inspect your currently held weapon similar to most modern FPS games.
Author: RediK1

The land down under is a dangerous place - and this makes it even more so. An incredible looking mod with a little cover and a lot of DAYNJA DAYNJA DAYNJA. 
Map Author: k24uk

"Projekt Z" is an atmospheric First-Person Zombie Co-Op-Shooter set in WW2. In this game, you get to play different characters, who have very different abilities, to find out more about the secrets of the German island you all crashed on.

This is the last iteration in the America's Army series that you can still download and play, though you won't find any official servers. I can still hop on and find a few people playing. You're also able to go to the shooting range and through basic training and a few other things. 
 
Steam Description:
America’s Army: Proving Grounds is the official game of the U.S. Army and part of the highly acclaimed America’s Army game series. This free military game focuses on small unit tactical maneuvers and puts you to the test in a wide variety of new America’s Army maps and AA fan favorites.

Afterconflict is a Realistic Cold War Multiplayer Tactical FPS, wherein the remnants of NATO and Warsaw Pact forces fight to the bitter end during the latter stages of World War 3.

Red Orchestra Series' take on Vietnam: 64-player MP matches; 20+ maps; US Army & Marines, PAVN/NVA, NLF/VC; Australians and ARVN forces; 50+ weapons; 4 flyable helicopters; mines, traps and tunnels; Brutal. Authentic. Gritty. Character customization. And napalm in the morning.

A simple free game that can be somewhat enjoyable in your free time. It's got building and a completely destructible environment. Most importantly, it's free. I don't play it much, but anytime I have, it felt like a pretty good game with some heavy recoil and non-stop action. 
Steam Description:
Sector's Edge is an indie free-to-play first person shooter with a completely destructible environment. It combines the fast-paced action and skill-based nature of Battlefield with the sandbox destruction of Ace of Spades.
Sector's Edge is an indie free-to-play first person shooter with a completely destructible environment. It combines the fast-paced action and skill-based nature of Battlefield with the sandbox destruction of Ace of Spades.
A RARE NEW ELEMENT
As a mercenary you fight for different factions across various planets with the hope of harnessing the power of Soltrium, a rare new element created in the core of a distant star.
System Requirements:
MINIMUM:
OS: Windows 7 or Higher
Memory: 2 GB RAM
Graphics: Nvidia Quadro FX 1700
Network: Broadband Internet connection
Storage: 1 GB available space
Additional Notes: Running with less than 2GB of GPU RAM will enable a compatibility mode that allows the game to run at higher frame rates on older computers.
RECOMMENDED:
OS: Windows 7 or Higher
Memory: 4 GB RAM
Graphics: GTX960 or Higher
Network: Broadband Internet connection
Storage: 1 GB available space

Not really a first person shooter, but certainly a hardcore tactical shooter. 
Thunder Tier One is a realistic top-down shooter where you join an elite special operations team tasked with stopping a dangerous terrorist organization wreaking havoc across the fictional Eastern European country of Salobia.

Made with one goal in mind - beautiful, fun gameplay. We're getting rid of as many frustrating elements of modern FPS games. Focused purely on infantry combat, expect constant action. Zero anti-consumer nonsense. Remember the golden era? Welcome back to the roots of what made gaming fun.
 

Hell Let Loose just dropped their latest update title "Falling Dark" and this brings some incredible new gameplay to the field. The thing I love about Hell Let Loose is the atmosphere it brings. It's not the MOST realistic experience, nor is it a real milsim, but the environment alone sucks you into the battlefield to feel like you're actually there. Despite only having World War 2 weapons, this is one of my favorite games and they continue to make it even better. Night maps bring a whole new dynamic that I feel makes those LARGE, OPEN maps actually enjoyable. 
 
Steam Description: 
Join the ever expanding experience of Hell Let Loose - a hardcore World War Two first person shooter with epic battles of 100 players with infantry, tanks, artillery, a dynamically shifting front line and a unique resource based RTS-inspired meta-game.
System Requirements:
 
MINIMUM:
Requires a 64-bit processor and operating system
OS: Windows10 64bit
Processor: Intel Core i5-6600/AMD Ryzen 3 1300X
Memory: 12 GB RAM
Graphics: NVIDIA GeForce GTX 960 4GB/AMD Radeon R9 380 4GB
DirectX: Version 11
Network: Broadband Internet connection
Storage: 30 GB available space
RECOMMENDED:
Requires a 64-bit processor and operating system
OS: Windows10 64bit
Processor: Intel Core i5-8400/AMD Ryzen 5 2600X
Memory: 16 GB RAM
Graphics: NVIDIA GeForce GTX 1060 6GB /AMD Radeon RX 590 8GB
DirectX: Version 11
Network: Broadband Internet connection
Storage: 30 GB available space

Trepang2 is a thrilling and graphical First-Person Shooter. Dodge bullets, sneak in the shadows, punch, kick and slide while unleashing your deadly gun skills on the bad guys who took everything from you…
You're a psychopath if you enjoy this game.
Steam Description:
Become the ultimate badass in Trepang2: A gory, action-packed FPS set in the distant future. Unleash all hell on your enemies, dodge bullets and leave a trail of destruction in this hardcore and frenetic shooter.
 
System Requirements:
MINIMUM:
Requires a 64-bit processor and operating system
OS: Windows 10 64 bit
Processor: Intel Core i5-2550K or AMD FX-8370
Memory: 8 GB RAM
Graphics: NVIDIA GeForce GTX 760, 2 GB or AMD Radeon HD 7870, 2 GB or Intel Arc A380, 6 GB
DirectX: Version 11
Storage: 35 GB available space
Additional Notes: Low 1080p @ 30 FPS
RECOMMENDED:
Requires a 64-bit processor and operating system
OS: Windows 10 64 bit
Processor: Intel Core i5-7600K or AMD Ryzen 5 2600X
Memory: 8 GB RAM
Graphics: NVIDIA GeForce GTX 1060, 6 GB or AMD Radeon RX 590, 8 GB, or Intel Arc A750, 8 GB
DirectX: Version 11
Storage: 35 GB available space
Additional Notes: High 1080p @ 60 FPS

Enlisted is a squad-based first person MMO shooter covering key battles from World War II. The game carefully recreates weapons, military vehicles and the atmosphere of that era, while demonstrating really massive clashes of numerous soldiers, tanks and aircraft with artillery and naval support.
Most of the Enlisted game modes simulate a battle involving several infantry platoons and gives the player control over a squad of soldiers with various roles (i.e. submachine gun soldier, sniper, radio operator, rifleman and others), a whole military vehicle crew or an aircraft pilot. One of the fighters is controlled directly, while others move and shoot independently following the player's general orders. In a situation where all the soldiers in the squad have fallen, a player respawns with the next available squad. This decision makes Enlisted battles look massive and spectacular while keeping the input of each individual player in the overall team victory quite significant.

Right now, the game is in an Alpha state but it’s getting better over time. The animations in this game  are top notch and the weapon models look great. Right now, The biggest issue I’ve got with it now is that it isn’t a stable build, as there is constant crashing, but once those get ironed out it’ll be much better. It can also occasionally feel like a typical zombie shooter - so more SCPs in the future will hopefully change that. 
 
Steam Description
SCP: Pandemic (Alpha) is a hardcore cooperative first-person tactical shooter. You are a rogue fireteam going against the SCP Foundation and their ongoing attempt of global omnicide. You start at Area 12, the site where the Psi-Z program is being actualized.

Operation: Harsh Doorstop is a Patreon funded tactical shooter that will be free upon release. Support us on Patreon and join us for our multiplayer playtests!

Battlebit is not what you'd expect it to be upon first look. The game surprised me with how good it is. HUGE battlefields with teamwork-oriented classes that offers loads of customization. The game just announced its release in June of 2023. There is an absolutely astonishing amount of destruction in this game to truly make it a sandbox experience. The servers are HUGE with up to 254 players that provide some crazy moments. While I'm not a huge fan of the blocky graphics in games, I'm a huge fan of this gameplay - the most important aspect, anyway, 
The game will be releasing for 15 dollars and you can try it one last time on June 9th-11th prior to the release to determine if you want to buy it.
Features include:
Up to 254 Player Servers
Medical System
Ammo Management System
Squad System
VOIP
Squad Strikes
Squad Supplies/Building
Destruction
Vehicles
More Destruction
Multiple Game Modes (Conquest, Rush, TDM, Domination)
Weapon Customization
Weapon Progression
Fun.
Discord: https://discord.gg/3mT2QjHq6T
Steam Description:
BattleBit Remastered is a low poly FPS that aims for a massively multiplayer experience with up to 254 players in a single server. Fight on a large battlefield with ground vehicles, boats, and air support. Create your own strategies to win in a near-fully destructible map.
 
SYSTEM REQUIREMENTS
MINIMUM:
Requires a 64-bit processor and operating system
OS: Windows 7 SP1 (x64 - x86)
Processor: Intel Core i5-2310
Memory: 4 GB RAM
Graphics: Geforce GTS 450 or equivalent or better
DirectX: Version 11
Network: Broadband Internet connection
Storage: 2 GB available space
RECOMMENDED:
Requires a 64-bit processor and operating system
OS: Windows 7 SP1 (x64 - x86), Windows 8 (x64 - x86), Windows 10 (x64 - x86)
Processor: Intel Core i5 4th Generation and above
Memory: 4 GB RAM
Graphics: Geforce GTX 600 Series or equivalent or better
DirectX: Version 11
Network: Broadband Internet connection
Storage: 2 GB available space

Ready or Not is definitely the most immersive and intense game that I've played. This game can get really, really difficult. With every update, they add loads of content and tweak the AI to find that "just right" area that makes each map slightly beatable, but you're going to die in this game...a lot. Unfortunately, the game is only Co-op at the moment, but they previously had PvP implemented prior to their release on steam. Hopefully that can make a comeback, but we'll see. Highly recommend if you like that slower-paced, danger-around-every-corner style of play.
 
 
Steam Description: 
Ready or Not is an intense, tactical, first-person shooter that depicts a modern-day world in which SWAT police units are called to defuse hostile and confronting situations.
 
SYSTEM REQUIREMENTS
MINIMUM:
Requires a 64-bit processor and operating system
OS: 64-bit Windows 7, Windows 8.1, Windows 10
Processor: Intel Core i5-4430 / AMD FX-6300
Memory: 8 GB RAM
Graphics: NVIDIA GeForce GTX 960 2GB / AMD Radeon R7 370 2GB
DirectX: Version 11
Storage: 50 GB available space
RECOMMENDED:
Requires a 64-bit processor and operating system
OS: 64-bit Windows 10
Processor: AMD Ryzen 5-1600 / Intel Core i5-7600K
Memory: 8 GB RAM
Graphics: Nvidia GTX 1060 6GB or better
DirectX: Version 11
Storage: 50 GB available space

Boundary is a multiplayer tactical space-based shooter game, engaging in fierce team vs team zero gravity firefights and executing low-gravity operations on orbiting space installations against other enemy astroperators and other entities.

A tactical FPS with online team-based action game play that takes place in a variety of locations in Bangladesh with Real-life scale & resource management. Inspired by various other tactical shooter games, Zero Hour tries to bring a very grounded CO-OP and Team vs Team experience in locations with real-life scale (no video game scale) and resource management. In multiplayer, both sides are tasked to wipe out the other team and complete objectives. The defenders are tasked to protect the bomb from being defused and keep their hostage from being rescued and running away. On the contrary, the attackers are to defuse the bomb or rescue the hostage held captive. In the CO-OP mode, based on the map you decide to play in, will have several objectives that will need to be completed in order to call for extraction.
 

CROWZ is a multiplayer game where players engage in battles as a mercenary called CROW. To survive as a hired soldier for the powerful nations, players either compete and accomplish the missions in a squad or experience major combats between factions in a disputed territory.
 
Fun fact - the game started off as a mobile game until devs decided to transition to a full-scale PC game. 

One of the best things about Deadside is it's environment. A gorgeous environment with a massive - MASSIVE - world. The game offers a first person and third person shooter with some lite survival mechanics - these being eating, drinking, and health. The game is currently in early access and despite it's giant size, it doesn't offer any vehicles yet, though those are coming. You can hop onto a server of around 50 players and shoot, loot, gather materials, and build your own custom base. As of now, you can't do anything like cut down trees for this base, so anything you want to add you've got to explore the world to find. One good thing about this game is that it's NOT a zombie shooter - the enemy AI are "scavs." The WORST part about the game, unfortunately, is the gunplay. I'm not a huge fan - but the game is gorgeous enough to keep me coming back occasionally.
Steam Description:
Deadside is a hardcore multiplayer shooter with survival elements. Post-Apocalypse, PvP, PvE, open world, realistic weapons, craft, base building
 
System Requirements:
MINIMUM:
Requires a 64-bit processor and operating system
OS: 64-bit Windows 7, Windows 8.1, Windows 10
Processor: Core i3 / AMD FX
Memory: 4 GB RAM
Graphics: GT 1030 / RX 550
DirectX: Version 11
Network: Broadband Internet connection
Storage: 25 GB available space
RECOMMENDED:
Requires a 64-bit processor and operating system
OS: 64-bit Windows 7, Windows 8.1, Windows 10
Processor: Core i5 / AMD Ryzen 5
Memory: 8 GB RAM
Graphics: GTX 1060 / RX 580
DirectX: Version 11
Network: Broadband Internet connection
Storage: 25 GB available space

POLYGON is a dynamic multiplayer team 1st person shooter. You have to battle on large-scale maps using various weapons with up to 32 players. Properly managing your existing arsenal and skills, you have to lead your team to victory!

This hardcore tactical shooter offers a simple yet satisfying first person shooter experience. Developed by one of the ORIGINAL Rainbow Six and Ghost Recon devs, this game aims to be one of the most realistic experiences on the market. Smooth gunplay, realistic mechanics, and a lot of fun. Whether it's single player, pvp, or pvE, this game is certainly an asset in the tactical shooter toolbox.  It's currently early access, so expect some bugs and such, but mod support is coming in the next update AND each update makes the game better and better. Recommended for solo gamers and tactical LARPers
 
Steam Description:
From one of the developers behind the original Rainbow Six® and Ghost Recon® games, comes a thinking-man's first-person shooter featuring in-depth character and weapon customization. Take your time. Think ahead. Get the job done.
 
 

World War 3 is certainly one of my favorite games. It's got the best of both worlds - hardcore, tactical shooter elements sprinkled with casual style gameplay. This has got to be some of the best gunplay in an arena shooter I've ever played. 
I'm probably just a fanboy. 
Steam Description:
World War 3 is a tactical online multiplayer FPS where the world is your battleground. Outgun the enemy in thrilling, team-based skirmishes with a huge arsenal of weapons, vehicles, gadgets, and drones at your disposal.
System Requirements:
MINIMUM:
Requires a 64-bit processor and operating system
OS: Windows 10 (x64)
Processor: Intel Core i3-4340K / AMD FX-6300
Memory: 8 GB RAM
Graphics: Geforce GTX 670/ GTX 1650 or AMD Radeon HD 7950
DirectX: Version 11
Network: Broadband Internet connection
Storage: 80 GB available space
RECOMMENDED:
Requires a 64-bit processor and operating system
OS: Windows 10 (x64)
Processor: Intel Core i5 2500k / AMD Ryzen R5 1600X
Memory: 16 GB RAM
Graphics: Geforce GTX 1060 or AMD Radeon R9 390 / AMD RX 580
DirectX: Version 12
Network: Broadband Internet connection
Storage: 80 GB available space

Insurgency: Sandstorm is a hardcore tactical shooter that brings the perfect balance between hardcore realism and casual movements. The game offers several different pvp game modes but also offers co-op game modes for those who prefer to fight with a team against AI enemies. And above everything else, the sound design is excellent. Click on "More Info" to grab the game and hop into an intense FPS experience. 
 
Steam Description:
Insurgency: Sandstorm is a team-based, tactical FPS based on lethal close quarters combat and objective-oriented multiplayer gameplay. Experience the intensity of modern combat where skill is rewarded, and teamwork wins the fight.
 
System Requirements:
MINIMUM:
Requires a 64-bit processor and operating system
OS: Windows 7/8/10 (64 bits)
Processor: Intel Core i5-4440 (3.10GHz)/AMD FX-6300 (3.50GHz)
Memory: 8 GB RAM
Graphics: NVIDIA GeForce GTX 760/AMD Radeon HD 7970
DirectX: Version 11
Storage: 40 GB available space
RECOMMENDED:
Requires a 64-bit processor and operating system
OS: Windows 7/8/10 (64 bits)
Processor: Intel Core i7-8700 (3.20GHz)/AMD Ryzen 7 2700 (3.20GHz)
Memory: 16 GB RAM
Graphics: NVIDIA GeForce GTX 980/AMD Radeon R9 390X
DirectX: Version 11
Storage: 40 GB available space
Additional Notes: SSD is recommended.