Games like Fallout 3 - Broken Steel
Games like Fallout 3 - Broken Steel include Fallout 4, Fallout: New Vegas, Fallout 3, S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition, and Kingdom Come: Deliverance II. We matched them by the tags players give Fallout 3 - Broken Steel on Steam (RPG, Post-apocalyptic, Adventure, First-Person, and Open World): closest matches first, and among equally close ones the better-known games.

Fallout 4
Shared: Post-apocalyptic · RPG · Open World

Fallout: New Vegas
Shared: RPG · Post-apocalyptic · Open World

Fallout 3
Shared: Post-apocalyptic · RPG · Open World

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: Post-apocalyptic · Open World · RPG

Kingdom Come: Deliverance II
Shared: RPG · Open World · First-Person

Tainted Grail: The Fall of Avalon
Shared: RPG · Adventure · Open World

The Elder Scrolls IV: Oblivion Remastered
Shared: RPG · Open World · Adventure

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

Kingdom Come: Deliverance
Shared: RPG · Open World · First-Person

The Elder Scrolls IV: Oblivion® Game of the Year Edition (2009)
Shared: RPG · Open World · First-Person

Rust
Shared: Open World · Adventure · First-Person

Far Cry® New Dawn
Shared: Open World · Post-apocalyptic · Adventure

Cyberpunk 2077
Shared: RPG · Open World · First-Person

ELEX
Shared: RPG · Post-apocalyptic · Open World

Starfield
Shared: RPG · Open World · First-Person

Metro Exodus
Shared: Post-apocalyptic · Open World · First-Person

Terminator: Resistance
Shared: Post-apocalyptic · First-Person · RPG

Mount & Blade: Warband
Shared: RPG · Open World · Adventure

Fallout 4 VR
Shared: Post-apocalyptic · RPG · Open World

The Elder Scrolls Online - Standard Edition
Shared: RPG · Adventure · Open World

Grand Theft Auto V Legacy
Shared: Open World · First-Person · Adventure

The Elder Scrolls III: Morrowind Game of the Year Edition
Shared: RPG · Open World · First-Person

Biomutant
Shared: RPG · Open World · Adventure

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