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GameMaker Studio

GameMaker Studio is a cross-platform game engine developed by YoYo Games. It is primarily used to make 2D games via a drag-and-drop visual programming language or a scripting language known as Game Maker Language.
The most complete tool for modding, decompiling and unpacking Undertale (and other GameMaker games!)
Source code of the MapServer project. Please submit pull requests to the 'main' branch.
A dictionary for people moving from GM:S to Godot
Modular game engine built with MonoGame, with GMS2-like workflow and advanced level editor
Official deegree repository providing geospatial core libraries, data access and advanced OGC web service implementations
(Spatial) data harmonisation with hale»studio (formerly HUMBOLDT Alignment Editor)
Warp is a feature-rich framework for multiplayer games, written in GameMaker and NodeJS (previously GM-Online-Framework)
3D city model viewer for Mac
A functional utility library for GML/GameMaker: Studio - partials, map/reduce and more
Validation of 3D primitives according to the international standard ISO19107
Stetl, Streaming ETL, is a lightweight geospatial processing and ETL framework written in Python.
Runtime room loading for GameMaker 2024.11+
🎶 GML bindings to the FMOD Studio low-level API for GM:S and GMS2. Can be used in Windows, macOS, and Linux games.
Source Code for a Sonic Fan Game Made in Game Maker Studio
XML schema and Schematron for aviation weather data exchange
R tools to write, read & validate geographic metadata (OGC/ISO 19110, 19115, 19119, 19136 and 19139)
Django speaking WFS 2.0 to expose geo data