There are 3 repositories under game-maker topic.
The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)
A highly flexible, voxel-powered game engine with an embedded editor. Create games using Lua, the native C/C++ API, and assets authored in voxel editors like MagicaVoxel or Avoyd.
Modular game engine built with MonoGame, with GMS2-like workflow and advanced level editor
A free, open source 2D online RPG engine in C#/.NET
Mega Man GameMaker Studio 1.4.1760 Engine
TileGameLib is a toolkit containing a pair of software libraries (one for C++, another for C#) for quick and easy development of tile-based, pseudo-8-bit games.
Also known as DBGHELP.DLL; Scheduler resolution fix for GM:Studio and GM8.1 (not to be confused with Debugger Helper)
A library with demo projects to learn Game Maker Studio and Game Maker Language (GML)
A modern fork of various IWBTG engines designed for GM8.2
A RenderDoc settings file generator for GameMaker: Studio 2 projects.
A metroidvania engine made in Game Maker Studio 2
The public repo of Retro FPS Studio (RFS), for educational reading and not for reuse. See license.
3000+ RGB colors (2k pantone) in code ready formats for SFML (C++), Game Maker (gml), Godot (tscn) & Unity (C#)
GitHub-ReadMe-Bagdes displaying "Made With game Maker" with the Game Maker Icon, based on shields.io badges, in markdown
A scope non-breaking foreach loop for arrays, lists, maps, structs, grids, strings and number ranges
An efficient bullet hell library made for Gamemaker Studio 2.3.0.
A mod for GameMaker 8.1 that includes many feature improvements and bugfixes.
Fan engine for the addictive video game series BIT.TRIP
Syntax highlighting for GML (Game Maker Language) files in Notepad++
A substitute IDE for GameMaker Studio 2 projects that works on linux
A collection of useful GML scripts for Game Maker Studio.
A game engine designed to make creating games fun!
A modern GBA game creation engine inspired by GB Studio. Build 32-bit GBA games with scene management, controller support, and easy audio import—designed for beginners and developers alike.
The program helps to correct inaccuracies in the conversion of projects from Game Maker 7/8 to Game Maker Studio 1 and GameMaker (Studio 2)
Jogo feito no GameMaker Studio 2 por alunos da Etec de São José dos Campos