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G3M review

Free#8 of 79 in Game Mod Managers

A broad, open-source toolkit for creating, managing, patching, and launching GameMaker mods.

7.7/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

G3M is an open-source desktop mod manager for GameMaker games, available on Windows, macOS, and Linux. It is aimed at mod creators and managers who need more than installation: the application covers discovery, local libraries, profiles, launching, editing, packaging, patching, conversion, and game management. Its built-in GameBanana browsing supports discovery, while installations can come from GameBanana, external URLs, local archives, and protocol links. Custom game management also lets users add games beyond its listed examples, including DELTARUNE, UNDERTALE, Pizza Tower, Sugary Spire, and FRICKBEARS3.

The main strength is the breadth of its mod workflow. Users can switch between multiple mod profiles, keep per-mod version snapshots, create game restore points, and review conflict diagnostics and launch preflight reports. Mod creation includes metadata, icons, and screenshots, while patch tools cover creation, application, merging, conversion, and file comparison. Downloads can be queued, retried, cancelled, installed, and controlled for overwrites. A plugin catalog, local plugin loading, and compatibility checks extend the application without reducing its focus on local game management.

G3M also fits a connected GameMaker modding ecosystem through GameBanana, Steam, and Discord integrations. Its GPL-3.0 license and multi-platform coverage make it a practical choice for creators who value inspectable software and flexible desktop deployment. Choose G3M if you need profiles, patching, conflict analysis, custom games, and creation tools in one application. Choose an alternative if your workflow depends on automatic mod updates or a manager designed for games outside the GameMaker focus.

G3M pros and cons

  • Where it wins
    • Built-in GameBanana browsing with multiple installation sources
    • Profiles, snapshots, restore points, and conflict diagnostics
    • Creation, patching, conversion, plugins, and custom game support
  • Where it doesn't
    • Focused on GameMaker games rather than general mod management
    • Automatic mod updates are not documented
    • Copy-based deployment may not suit every workflow

G3M fact sheet, pricing and score →

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