What are some alternatives?
When comparing Call of Duty and Counter-Strike, you can also consider the following products
Battlefield - The latest news and updates for all things Battlefield, the EA and DICE video game franchise.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Doom - Doom is a science fiction horror-themed first-person shooter video game in which players assume the...
Quake - Quake is a series of first-person shooter video games released by id Software.
AssaultCube - AssaultCube is a FREE multiplayer first-person shooter game. Taking place in realistic environments, with fast, arcade gameplay, it's addictive and fun!
Overwatch - Stylized team-based FPS