List of freeware first-person shooters

This is a list of some of the most popular freeware and free and open-source software first-person shooter games.

Freeware clients
Some free-to-play online first-person shooters use a client–server model, in which only the client is available for free. They may be associated with business models such as optional microtransactions or in-game advertising. Some of these may be MMOFPS, MMOTPS or MMORPG games.