https://www.change.org/p/cod4community-call-of-duty-4-comeback-mod-with-matchmaking-skins-client
There's a petition that has almost reached its goal for a promod comeback standalone game! If you are interested in making this happen please click the link above.
If you are unsure of what COD4 Promod is, heres a summary:
COD4 Promod is a modification to COD 4 Modern Warfare that makes it more competitive and skill based. Many say it's more like Counter-Strike and that is somewhat true. In ways that it differs is that weapons are more hard-hitting(Most weapons kill in 2-3 shots), It's very fast paced and requires a lot of flick aiming, there is a "interesting" movement system, and the teams are divided into classes: Assault, Spec-Op/SMG, Scope/Sniper, and Demo(Demo is the shotgun class and its never used because it is severally under-powered). COD4 Promod is a unique mix of games and in it's simplicity is oddly, a very unique game.
TL;DR - COD4 Promod is a mod that makes the game more skill-based simplifying the game with weapon locked classes and no killstreaks or any other bullshit in the vanilla COD4
Heres a video if you still don't understand: (Gameplay) https://www.youtube.com/watch?v=8M5k9wi0WKo
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Please consider signing, It'd mean a lot to a community of people who wish to resurrect a game that died too soon.