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SPECIFICTION
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G3M

github.com

Free plan WindowsmacOSLinux
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Spec score 8.8 #3 of 78 in Mod managers

What it is

G3M is a free, open-source desktop manager for GameMaker mods. It can browse supported GameBanana games and install mods from GameBanana, external URLs, local archives, or one-click links. Built-in game entries include DELTARUNE, DELTARUNE Demo, UNDERTALE, UNDERTALE Yellow, Pizza Tower, Sugary Spire, and FRICKBEARS3; users can also add custom games through its Game Manager.

Multiple library profiles can hold separate active mod selections and settings. The Mod Editor combines patches, file replacements, and archive contents, while other tools create and apply patches, merge patch sets, compare files, export diff reports, and convert supported formats. Supported games can launch directly or through Steam where available; Linux users can use PortProton for compatible Windows games. Its Catalog includes themes and plugins, including tools for DELTARUNE saves and custom save folders. Downloads are available for Windows, Linux, and macOS on x86_64 and ARM64 computers. The project states that normal launch mode restores game files after the game closes.

Spec sheet

What it does
G3M is a desktop manager for GameMaker mods that can browse GameBanana, install and organize mods, switch profiles, create patches, and launch supported games.Read 12 Oct 2026 · github.com
Purpose
G3M is a desktop manager for GameMaker mods that can browse, install, organize, and launch supported games with mods.Read 11 Oct 2026 · github.com
Platforms
Release packages are available for Windows, Linux, and macOS on x86_64 and ARM64 computers.Read 11 Oct 2026 · g3m.gitbook.io
Integrations
G3M integrates with GameBanana and can launch supported games through Steam where available; Linux users can use PortProton for compatible Windows games.Read 12 Oct 2026 · github.com
Support
The project links to community help on Discord and Telegram.Read 12 Oct 2026 · g3m.gitbook.io
License
The application is distributed under GPL-3.0.Read 12 Oct 2026 · g3m.gitbook.io
Catalog
The Catalog offers plugins and themes, including plugins for managing DELTARUNE saves and choosing custom save folders.Read 11 Oct 2026 · github.com
Conflict detection
YesRead 20 Sep 2026 · raw.githubusercontent.com
Custom games
Users can add custom GameMaker games through the in-app Game Manager.Read 11 Oct 2026 · github.com
Deployment method
copyRead 20 Sep 2026 · raw.githubusercontent.com
Download platforms
Release downloads are available for Windows, Linux, and macOS on x86_64 and ARM64 computers.Read 12 Oct 2026 · github.com
Game file handling
The normal launch mode restores game files after the game closes.Read 12 Oct 2026 · g3m.gitbook.io
Game launch
Supported games can launch directly or through Steam where available, and Linux users can use PortProton for compatible Windows games.Read 11 Oct 2026 · github.com
Mod discovery
The app browses supported GameBanana games and can install mods from GameBanana, external URLs, local archives, or one-click install links.Read 12 Oct 2026 · github.com
Mod editing
The Mod Editor combines patches, file replacements, and archive contents, and supports exporting mods to share.Read 12 Oct 2026 · github.com
Mod profiles
YesRead 20 Sep 2026 · raw.githubusercontent.com
Mod source access
built-inRead 20 Sep 2026 · raw.githubusercontent.com
Mod tools
G3M can create and apply patches, merge patch sets, compare files, export diff reports, and convert mods between supported formats.Read 11 Oct 2026 · github.com
Patching tools
Built-in tools create and apply patches, merge patch sets, compare files, and export diff reports.Read 12 Oct 2026 · github.com
Plugins
The Catalog offers plugins including DR Save Manager for DELTARUNE saves and Custom Saves Folders for selecting save locations.Read 12 Oct 2026 · github.com
Profiles
Users can create multiple library profiles with separate active mod selections and profile-scoped settings.Read 12 Oct 2026 · github.com
Security support
Security fixes are provided on a best-effort basis for the main branch and latest release; older releases are unsupported.Read 11 Oct 2026 · github.com
Supported games
Built-in game entries cover DELTARUNE, DELTARUNE Demo, UNDERTALE, UNDERTALE Yellow, Pizza Tower, Sugary Spire, and FRICKBEARS3, and users can add custom games.Read 12 Oct 2026 · github.com
Supported platforms
multi-platformRead 20 Sep 2026 · raw.githubusercontent.com
Themes and languages
G3M supports installed or imported themes and ships with English, Russian, Spanish, Korean, Japanese, Simplified Chinese, and Traditional Chinese language packs.Read 12 Oct 2026 · github.com
Vulnerability reporting
The security policy requests private reports, preferably through GitHub Security Advisories, and gives best-effort targets of 72 hours for acknowledgement and 14 days for triage.Read 11 Oct 2026 · github.com

Plans and prices

G3M Free GPL-3.0 desktop application Read 12 Oct 2026 · github.com

Every G3M plan and price →

Strong points and limits

Strong points

  • Supports multiple profiles with separate mod selections
  • Installs mods from GameBanana, URLs, and local archives
  • Includes patch creation, merging, and file comparison
  • Supports Windows, Linux, and macOS
  • Normal launch mode restores game files afterward

Limits

  • Older releases do not receive security support
  • Security fixes are best-effort for the main branch and latest release

Who it suits

G3M suits players who manage mods for supported GameMaker games and want separate mod profiles or built-in patching tools. It is available for Windows, Linux, and macOS.

Verdict

G3M combines mod discovery, profile management, editing, and game launching in a free desktop application. Its security support is limited to best-effort fixes for the main branch and latest release.

Where Specifiction places it

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