Crossfire

Newest installment in the Crossfire franchise from Radiangames. Blast alien invaders while warping between the top and bottom of the screen in this heart-pumping adventure from Radiangames. Unlock upgrades and acquire special power-ups as you obliterate wave after wave of enemies.

CrossFire is a first-person shooter that features two mercenary corporations named the "Black List" and "Global Risk," fighting each other in an epic global conflict. Players assume the role of either a Black List or Global Risk mercenary, joining an online team that must work together to complete objective-based scenarios. With the exception of the Zombie mode and Wave mode, each mode can support a maximum of 16 players (except Wave mode), each divided into an 8-man team (5 for Wave mode). There are more than ten online modes: Team Death Match, Search and Destroy, Elimination Match, Ghost Mode, Free-For-All, Mutation Mode, Escape Mode, Hero Mode, Hero Mode X, Zombie mode, Elite mode, Wave Mode, Shadow Mode, Biochemical Knight Mode, Ghosts vs Mutants, RPG/Melee Mode, Soccer Mode, Light Mode, and Super Soldiers TD. Based on their performance in-game, players will receive experience points and be promoted through various Military Ranks. The lowest rank is trainee first class, the highest is Marshall. Players also have the ability to customize their character's equipment and appearance through CrossFire's in-game item shop and from the Mall in the website. CrossFire is free to download and playable online. It has a free currency which is called Game Points (GP), which are earned through playing and completing matches, buying premium items that grant bonus GP, or fulfilling certain missions. Premium and special items like modified weapons can only be bought using points which are obtained using real money in the form of cards or online transactions. The content and the name of the points tends to vary from version to version.

The first in the radiangames series, JoyJoy is a pastel colored twin-stick shooter with a variety of weapons.

Play the world's number 1 online action game. Engage in an incredibly realistic brand of terrorist warfare in this wildly popular team-based game. Ally with teammates to complete strategic missions. Take out enemy sites. Rescue hostages. Your role affects your team's success. Your team's success affects your role.

In Battlefield 2, players will choose to fight for one of three military superpowers: the United States, the Chinese, or the newly formed Middle East Coalition. Armed with the latest modern weaponry, players can take control of any of the game’s 30+ vehicles to engage in major conflicts with over 64 players in some of the largest online battles on the PC. Additionally, persistent character growth allows players to rise through the ranks and attain the ultimate rank of General.

With its extensive Tour of Duty campaign, a near-limitless number of skirmish modes, updates and new content for Counter-Strike's award-winning multiplayer game play, plus over 12 bonus single player missions, Counter-Strike: Condition Zero is a tremendous offering of single and multiplayer content.

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Breach & Clear brings deep tactical strategy simulation to PC, Mac and Linux! Build your Special Operations team, plan and execute advanced missions, and own every angle. Choose your real-world squad -- US Army Rangers, Germany's KSK, Canada’s JTF2, UK SAS, and more -- and take on a variety of foes with different skill-sets and abilities. Learn to approach, engage, and dominate your opponents through superior tactics and training.

Global Operations is a first-person tactical shooter computer game developed by Barking Dog Studios and published by both Crave Entertainment and Electronic Arts. It was released in March 2002. (Wikipedia)

Squad is a large scale combined arms multiplayer first-person shooter emphasizing combat realism through communication, team play, emphasizing strong squad cohesion mechanics as well as larger-scale coordination, tactics, and planning. It features 20 large open maps, vehicle-based combined arms gameplay, and player-constructed bases to create a heart-thumping, visceral gaming experience with split-second decision-making in real-world scale firefights.

Escape from Tarkov is a hardcore and realistic online first-person action RPG/Simulator with MMO features and story-driven walkthrough.