The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)
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Updated
Sep 7, 2026 - C#
The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)
Modular game engine built with MonoGame, with GMS2-like workflow and advanced level editor
A GML supplement library for GMS 2.3+
Static site for viewing Undertale/Deltarune game scripts made so we have a site to reference when citing code on Undertale/Deltarune Wiki (original by xkeeper).
A RenderDoc settings file generator for GameMaker: Studio 2 projects.
A metroidvania engine made in Game Maker Studio 2
Pathfinding and navigation for GameMaker. Resumable A*, flow fields, cost fields, clearance, isometric and hex grids, platformer jump arcs. Pure GML.
List of resources to learn game development related skills
An efficient bullet hell library made for Gamemaker Studio 2.3.0.
A proof of concept mod loader for Gamer Maker Studio games that uses UndertaleModLib to patch mods independently so multiple mods can be used at once.
GitHub-ReadMe-Bagdes displaying "Made With game Maker" with the Game Maker Icon, based on shields.io badges, in markdown
An object pooling implementation in GML for Game Maker Studio 2.3+
My custom and pretty readable version of a RegEx like string manipulator made in GM for GM 2.3+
A substitute IDE for GameMaker Studio 2 projects that works on linux
Manages multiple animations for a single sprite strip by flagging start and end points of the animations for GameMaker Studio 2.3.3+
an easy HTTP server implementation for GameMaker projects
Game Maker Language with types (2.3 beta)
A Yume Nikki fangame from Brazil
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