Outline System for Gamemaker 2.3+
Outline system for GMS2
mMcFabs's Texture to SkyBox Converter
Convert flat horizontal tiling textures to convincing skyboxes with relative ease!
Online Fighting Engine - GameMaker Source Code
Source code gameMaker Online PvP Engine
Sprite Anchor Animator
Create anchor points, manage hitboxes, and more! For Game Maker projects
Micro16
Micro16 Virtual Computer
PushEd - 2D/3D Level Editor (for GameMaker: Studio)
Level Editor for GameMaker: Studio
MMO Engine 2 - GameMaker Source Code
Source code learn to create online multiplayer games with this engine
MMO Engine - GameMaker Source Code
GameMaker Online Engine
Online Voice Chat - GameMaker Source Code
Online Voice Chat
TAB - Thinbasic Adventure Builder
Text Adventure Creator for PC Windows XP and above. Tool/Utility for making Interactive Fiction (32/64bit)
GM-Ez-Console
A simple terminal console to debug your GameMaker games.
Localization Editor
Edit, add and erase translations from CSV files
Palette Harmonizer
Match color vibes across images or tilesets!
Shady – Shader Preprocessor for GameMaker
GameMaker shader preprocessor for code reuse! Import and inline directives, generating shader variants.
sk Creator
Animatable skeletons in GameMaker
GMS2: Grid-Based Pathfinding Scripts
GML scripts to make adding pathfinding to your game easy
Löve Copy
Love2d For JavaScript
Palette Wizard
Create custom color palettes with ease
YY-Reunion
Repairs and re-imports missing resources into GMS2.2 projects!
autotile packing tools
A set of drag-and-drop tools for windows to pack and unpack autotile-based images, like from rpgmaker
Laconic Dialogue Writer
A tool for writing and encoding dialogue, and managing dialogue assets
Chat Packit
Communication Package made for Students, by Students
Simple Fursona Generator
A simple fursona generator.
BMFont to GameMaker converter
Converts BMFont fonts into GM:S/GMS2 project resources.