https://itch.io/s/102664/indie-gamemaker-developers-pack

If you are a GameMaker developer you should check this out

it includes everything that most users want

GameMaker MMO Engine$5

-75%

Complete GameMaker MMO Engine

Mohamad Hani Janaty

Advanced Lighting For GameMaker$3.75

-75%

Advanced Lighting System For GameMaker

Mohamad Hani Janaty

Real Time Strategy Engine (Complete Project)$5

-75%

RTS Engine For GameMaker

Mohamad Hani Janaty

Infinite Procedural Terrain Engine for GameMaker$3.75

-75%

Producual Infinite Terrain For GameMaker

Mohamad Hani Janaty

Voxel Engine For GameMaker$5

-75%

Complete Voxel Renderer In GameMaker

Mohamad Hani Janaty

Source: itch.io