Games like Skullborn
Games like Skullborn include Trove, Black Desert, Rust, ARK: Survival Evolved, and Pax Dei. We matched them by the tags players give Skullborn on Steam (Adventure, Sandbox, MMORPG, Voxel, and Crafting): closest matches first, and among equally close ones the better-known games.

Trove
Shared: MMORPG · Sandbox · Voxel

Black Desert
Shared: Sandbox · MMORPG · Action RPG

Rust
Shared: Crafting · Sandbox · Adventure

ARK: Survival Evolved
Shared: Adventure · Crafting · Base Building

Pax Dei
Shared: Sandbox · MMORPG · Crafting

Scrap Mechanic
Shared: Sandbox · Crafting · Adventure

ARK: Survival Ascended
Shared: Adventure · Crafting · Base Building

Deadside
Shared: Crafting · Base Building · Sandbox

Satisfactory
Shared: Base Building · Crafting · Sandbox

Albion Online
Shared: MMORPG · Sandbox · Massively Multiplayer

Enshrouded
Shared: Base Building · Adventure · Crafting

Raft
Shared: Crafting · Adventure · Base Building

Dune: Awakening
Shared: Adventure · Sandbox · Base Building

ATLAS
Shared: Adventure · Crafting · Massively Multiplayer

Dark and Light
Shared: Sandbox · Adventure · Massively Multiplayer

Boundless
Shared: Sandbox · Massively Multiplayer · Adventure

FINAL FANTASY XIV Online
Shared: MMORPG · Massively Multiplayer · Adventure

Guild Wars 2®
Shared: Adventure · MMORPG · Massively Multiplayer

Terraria
Shared: Sandbox · Adventure · Crafting

Mortal Online 2
Shared: Sandbox · MMORPG · Crafting

Neverwinter
Shared: MMORPG · Adventure · Massively Multiplayer

The Forest
Shared: Adventure · Crafting · Sandbox

The Elder Scrolls Online - Standard Edition
Shared: MMORPG · Adventure · Massively Multiplayer

7 Days to Die
Shared: Base Building · Voxel · Sandbox