Games like Outcast 1.1
Games like Outcast 1.1 include The Witcher 3: Wild Hunt — Remastered, Grand Theft Auto V Legacy, Bully: Scholarship Edition, STAR WARS Jedi: Survivor™, and Monster Hunter: World. We matched them by the tags players give Outcast 1.1 on Steam (Adventure, Action, Classic, Third Person, and Open World): closest matches first, and among equally close ones the better-known games.

The Witcher 3: Wild Hunt — Remastered
Shared: Open World · Adventure · RPG

Grand Theft Auto V Legacy
Shared: Action · Open World · Third Person

Bully: Scholarship Edition
Shared: Action · Adventure · Open World

STAR WARS Jedi: Survivor™
Shared: Action · Adventure · Open World

Monster Hunter: World
Shared: Action · Open World · Adventure

Fallout 4
Shared: Open World · Adventure · RPG

Middle-earth: Shadow of War
Shared: Action · Open World · Adventure

Grand Theft Auto IV: The Complete Edition
Shared: Action · Open World · Adventure

Rise of the Tomb Raider™
Shared: Adventure · Action · Third Person

Middle-earth™: Shadow of Mordor™
Shared: Action · Adventure · Open World

God of War
Shared: Action · Adventure · Third Person

STAR WARS™ Knights of the Old Republic™
Shared: Adventure · RPG · Classic

Red Dead Redemption 2
Shared: Adventure · Open World · Action

Black Mesa
Shared: Action · Sci-fi · Classic

Gothic 1 Classic
Shared: Classic · Open World · RPG

Crimson Desert Enhanced
Shared: Action · Adventure · Open World

Half-Life 2
Shared: Action · Classic · Adventure

Hogwarts Legacy
Shared: Adventure · Open World · RPG

Fable - The Lost Chapters
Shared: Adventure · Action · RPG

Mafia II (Classic)
Shared: Action · Open World · Third Person

Star Wars Outlaws
Shared: Action · Adventure · Open World

Fallout: New Vegas
Shared: Open World · RPG · Action

Assassin's Creed 2
Shared: Action · Open World · Adventure

Yakuza Kiwami
Shared: Action · Adventure · Open World