The first list contains free FPS games that are set in modern day or in the past (WW2 for example). The gameplay in these online FPS games is usually similar to Call of Duty or Counter-Strike. Most of them have small urban maps and modern weapons. There are many free MMOFPS's where better weapons can only be purchased with real world money. All shooters have minimum system requirements listed (if available), with links to official website or download page.