3D Collisions in GameMaker
3D collision detection in native GML
Firehammer Audio
Quality audio production for your Gamemaker Games
VoiceLine Controller For GMS 2.3
A sound system that (with some programming) can decide which line to play/what action to do..
GMS2 Simple Button source code
Simple button in Game Maker Studio 2
Fully-Customizable Zelda Hearts System
Open-source example showing how to make a Zelda-style hearts system