I.G.I. (Series) is described as 'I.G.I. is an action shooting computer game developed by Innerloop Studios and released by Eidos Interractive then Codemasters. The games are stealth-based first person shooter'. There are five alternatives to I.G.I. (Series) for a variety of platforms, including Windows, Steam, Playstation, Xbox and Mac. The best alternative is Arma. It's not free, so if you're looking for a free alternative, you could try Warface. Other great apps like I.G.I. (Series) are Tom Clancy's Ghost Recon (Paid), Tom Clancy's Rainbow Six (Paid) and Hidden & Dangerous (Series) (Paid).
Experience true combat gameplay in a massive military sandbox. Deploying a wide variety of single- and multiplayer content, over 20 vehicles and 40 weapons, and limitless opportunities for content creation, this is the PC’s premier military game. Represent entire series of Arma games.
Tom Clancy's Ghost Recon is an American video game series of military tactical shooters, created by Red Storm Entertainment, a game development studio founded in part by American author Tom Clancy. Represent entire series of Tom Clancy's Ghost Recon games.
Warface is a contemporary MMO first person shooter with millions of fans around the world. It offers intense PvP modes, compelling PvE missions and raids that you can challenge with four diverse classes and a colossal customizable arsenal.