Games like Wurm Unlimited
Games like Wurm Unlimited include Rust, Terraria, ARK: Survival Evolved, Valheim, and Raft. We matched them by the tags players give Wurm Unlimited on Steam (Open World Survival Craft, Open World, Sandbox, RPG, and Crafting): closest matches first, and among equally close ones the better-known games.

Rust
Shared: Open World · Open World Survival Craft · Crafting

Terraria
Shared: Open World Survival Craft · Sandbox · Survival

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

Valheim
Shared: Open World Survival Craft · Open World · Survival

Raft
Shared: Open World Survival Craft · Survival · Open World

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

Palworld
Shared: Open World · Open World Survival Craft · Survival

Project Zomboid
Shared: Open World · Open World Survival Craft · Survival

The Forest
Shared: Open World Survival Craft · Open World · Survival

Once Human
Shared: Open World · Open World Survival Craft · Survival

Conan Exiles Enhanced
Shared: Open World · Open World Survival Craft · Survival

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

ARK: Survival Ascended
Shared: Open World · Survival · Crafting

Satisfactory
Shared: Open World · Crafting · Sandbox

Necesse
Shared: Open World Survival Craft · Open World · Sandbox

ASTRONEER
Shared: Open World Survival Craft · Open World · Survival

Scrap Mechanic
Shared: Sandbox · Open World · Building

Sons Of The Forest
Shared: Open World · Survival · Multiplayer

Enshrouded
Shared: Open World · Survival · Crafting

Grounded
Shared: Open World Survival Craft · Survival · Open World

Dune: Awakening
Shared: Open World Survival Craft · Survival · Sandbox

Green Hell
Shared: Open World Survival Craft · Open World · Survival

Craftopia
Shared: Open World · Open World Survival Craft · Crafting

Starbound
Shared: Open World Survival Craft · Sandbox · Survival