Games like Z-Company
Games like Z-Company include Left 4 Dead 2, The Last Stand: Aftermath, Ultimate Zombie Defense, PUBG: BATTLEGROUNDS, and DayZ. We matched them by the tags players give Z-Company on Steam (Action, Casual, Shooter, Tower Defense, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

Left 4 Dead 2
Shared: Shooter · Action · Zombies

The Last Stand: Aftermath
Shared: Top-Down Shooter · Shooter · Zombies

Ultimate Zombie Defense
Shared: Action · Casual · Tower Defense

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · Survival

DayZ
Shared: Shooter · Zombies · Post-apocalyptic

Escape From Duckov
Shared: Action · Shooter · Top-Down Shooter

Plants vs. Zombies: Battle for Neighborville™
Shared: Shooter · Casual · Zombies

7 Days to Die
Shared: Zombies · Post-apocalyptic · Survival

RUNNING WITH RIFLES
Shared: Action · Top-Down Shooter · Top-Down

Left 4 Dead
Shared: Action · Zombies · Shooter

Arma 3
Shared: Action · Shooter · Military

Cluckmech Oasis
Shared: Tower Defense · Top-Down Shooter · Action

s&box
Shared: Casual · Action · Shooter

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Casual · Zombies

Killing Floor 2
Shared: Zombies · Shooter · Action

Call of Duty®
Shared: Shooter · Action · Military

Zombieville USA 3D
Shared: Action · Shooter · Top-Down Shooter

Squad
Shared: Shooter · Action · Military

Splatter - Zombiecalypse Now
Shared: Action · Top-Down Shooter · Zombies

Bloons TD 6
Shared: Tower Defense · Casual · 3D

Pavlov
Shared: Shooter · Action · Zombies

Call of Duty®: Black Ops III
Shared: Action · Shooter · Zombies

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

World War Z
Shared: Action · Zombies · Shooter