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G3M

Free#8 of 79 in Game Mod Managers

G3M: A broad, open-source toolkit for creating, managing, patching, and launching GameMaker mods. Ranked #8 of 79 in Game Mod Managers by our editors (7.7/10); pricing: Open source; best for cross-platform mod creators and managers.

7.7/10Editor score

Visit G3M

G3M7.7 Visit G3M

At a glance

Editor score
7.7 / 10
Pricing
Open source
Best for
Cross-platform mod creators and managers
Paid from
Free
Mod profiles
Yes
Facts checked
20 Sep 2026

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

Our verdict on G3M

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.

Your product? Our editors can test G3M in depth and publish a review, labelled as paid · from $149/mo →

G3M pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on github.com

G3M fact sheet

Free plan	Not verified
Paid from	Free
Mod profiles	Yes
Conflict detection	Yes
Automatic updates	Not verified
Mod source access	Built-in
Supported platforms	Multi-platform
Deployment method	Copy
Deployment	Desktop
Platforms	Windows, macOS, Linux
Integrations	3 integrations: GameBanana, Steam, Discord
Pricing	Open source
Website	github.com
Facts checked	20 Sep 2026

G3M integrations

G3M lists 3 integrations on its own site.

GameBanana
Steam
Discord

Alternatives to G3M

See all G3M alternatives →

G3M vs the competition

Compare G3M with any tool side by side →

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Featured on iTechGuides

G3M is listed in our Game Mod Managers directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update