Games like Aggressor
Games like Aggressor include Aimlabs, KovaaK's, Arma 3, War Thunder, and Ravenfield. We matched them by the tags players give Aggressor on Steam (Action, Simulation, 3D Fighter, Shooter, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Aimlabs
Shared: Simulation · Action · Shooter

KovaaK's
Shared: Action · Simulation · Shooter

Arma 3
Shared: Action · Simulation · Shooter

War Thunder
Shared: Action · Simulation · Flight

Ravenfield
Shared: FPS · Shooter · Action

WARDOGS
Shared: Action · FPS · Shooter

MechWarrior 5: Mercenaries
Shared: Simulation · Action · Shooter

Arma Reforger
Shared: Simulation · Shooter · Action

Battlefield™ 2042
Shared: Shooter · FPS · Action

BattleBit Remastered
Shared: Shooter · FPS · Action

Call of Duty®
Shared: Action · Shooter · FPS

Hell Let Loose: Vietnam
Shared: Action · Simulation · Shooter

FPV Kamikaze Drone
Shared: Action · Simulation · Shooter

Enlisted
Shared: Action · FPS · Shooter

Nuclear Option
Shared: Simulation · Action · Flight

OPERATOR
Shared: Action · Shooter · Simulation

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · FPS

Battlefield™ 6
Shared: Action · FPS · Shooter

Battlefield™ 1
Shared: FPS · Action · Shooter

MechWarrior 5: Clans
Shared: Action · Simulation · Shooter

Hell Let Loose
Shared: Shooter · Action · FPS

ACE COMBAT™ 7: SKIES UNKNOWN
Shared: Shooter · Action · Flight

Counter-Strike: Source
Shared: Action · Shooter · FPS

Wolfenstein: The New Order
Shared: Action · FPS · Shooter