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Counter-Strike: Global Offensive (CS:GO): A tactical shooter demanding strategy, teamwork, and precise aim.
Overwatch 2: A hero-based team shooter featuring diverse characters with unique abilities.
Valorant: A tactical shooter blending precise gunplay with agent abilities, emphasizing strategic depth.
Rainbow Six Siege: Focuses on close-quarters combat, environmental destruction, and meticulous planning.
Call of Duty: Modern Warfare II (2022): Offers classic modes like Team Deathmatch, Domination, and Search & Destroy.
Battlefield 2042: Large-scale warfare with massive maps, vehicles, and 128-player matches.
Apex Legends: Fast-paced battle royale with unique legends and squad-based gameplay.
Splitgate: Arena shooter adding portal mechanics for high-mobility combat.
Destiny 2: Looter-shooter with strong cooperative PvE content like raids and strikes.
Warface: Traditional military FPS with co-op and competitive modes.
Team Fortress 2: Class-based shooter known for its humor, distinct art style, and deep community.
Brawlhalla: Platform fighter (not an FPS) featuring weapon-based combat; included here as a popular free-to-play alternative.
Halo Infinite: Arena-style combat with a focus on competitive multiplayer.
PUBG: Battlegrounds: The battle royale pioneer emphasizing realistic survival.
Fortnite: Battle royale with building mechanics and constant seasonal updates.
Escape from Tarkov: Hardcore extraction shooter with realistic ballistics and survival mechanics.
Insurgency: Sandstorm: Tactical military shooter prioritizing realism and team coordination.
This list is a starting point. Many other excellent online FPS games exist — explore to find the playstyle that suits you best.