There are 2 repositories under gamemaker-snippets topic.
🌌 A script to generate starfields in GameMaker’s GML language
GML Snippets & Syntax Highlighting for SublimeText 2
A Library Full of useful scripts for implementing your UI designs in Gamemaker Studio 2
A series of coding experiments exploring GameMaker Studio 2 feature "Use Physics" that you can learn from and use as guides.
Independent functions assisting development in GameMaker Language.