Planet Side 2 is a huge free to play FPS.The three factions war for the planet Auraxis and each has particular weaponry and vehicles. By following the link below you can download it, but also you get an in game starter pack for free, and I get some rewards too. It’s a win win for everyone!
https://recruit.soe.com/recruit/smlanding.action?iId=N7MP8BLQT8VNWOIKQ3FA&gamecode=PS2
Check it out here (but download it with the above link for the package!)- https://www.planetside2.com