Games like Fallen Earth Classic
Games like Fallen Earth Classic include Rust, DayZ, Once Human, Project Zomboid, and 7 Days to Die. We matched them by the tags players give Fallen Earth Classic on Steam (Free to Play, Survival, Open World, Multiplayer, and Post-apocalyptic): closest matches first, and among equally close ones the better-known games.

Rust
Shared: Survival · Open World · Multiplayer

DayZ
Shared: Survival · Open World · Multiplayer

Once Human
Shared: Free to Play · Open World · Survival

Project Zomboid
Shared: Survival · Open World · Multiplayer

7 Days to Die
Shared: Survival · Open World · Multiplayer

Destiny 2
Shared: Free to Play · Open World · Multiplayer

Albion Online
Shared: Free to Play · Open World · Multiplayer

Miscreated
Shared: Survival · Open World · Multiplayer

ARK: Survival Evolved
Shared: Survival · Open World · Multiplayer

PUBG: BATTLEGROUNDS
Shared: Survival · Multiplayer · Shooter

Left 4 Dead 2
Shared: Zombies · Multiplayer · Survival

STALZONE
Shared: Open World · Free to Play · Post-apocalyptic

Apex Legends™
Shared: Free to Play · Multiplayer · Shooter

Halo Infinite
Shared: Free to Play · Multiplayer · Open World

Don't Starve Together
Shared: Survival · Multiplayer · Open World

Raft
Shared: Survival · Multiplayer · Open World

Delta Force
Shared: Free to Play · Multiplayer · Massively Multiplayer

Deadside
Shared: Survival · Multiplayer · Crafting

Tom Clancy’s The Division™
Shared: Open World · Multiplayer · Survival

Palworld
Shared: Survival · Open World · Multiplayer

Days Gone
Shared: Open World · Survival · Zombies

Fallout 76
Shared: Open World · Multiplayer · Post-apocalyptic

Terraria
Shared: Survival · Multiplayer · Crafting

Far Cry 3
Shared: Open World · Multiplayer · FPS