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Games like Quality Structures

Livecoding for GameMaker: Studio / GameMaker Studio 2
Better and safer JSON functions.
Package GameMaker rooms and load them as you please
Dynamic scripting on Win/Mac/Linux.
Error handling for GameMaker games
Work with files in all accessible places in GameMaker games.
Better INI functions for GameMaker: Studio
Tiny animated 16x16 tileset with 64 colors!
Unified API for mouselock on desktop and HTML5 for GameMaker.
Get information about the player's screen(s)!
Raw Input
Use multiple mice and keyboards in GameMaker games!
Automatically import and manage sprites in GameMaker Studio 2.
Prevents GameMaker games from freezing while being dragged/resized.
Auto-organize audio files in compiled GMS games into directories
Fixing the draw_sprite_pos function with a shader and one script.
Skeletal animation system for GameMaker:Studio
Creating textured terrains for physics games.
Create blood/paintball splashes in your game
Path-based racing game engine.
Buttons, windows, item slots - fully generic and extensible!