GM Alter Ego is a Model Format Converter for GameMaker. It converts various model formats(.x, .md2, .md3, .obj, .3ds, .ms3d) to the GameMaker format (.mod or .gmmod). It also allows you to modify and preview the model. The program is used independently from GameMaker itself.
The tool definitely isn’t finished as it is, there are a lot of missing features and other stuff I’d still like to do with it. Unfortunately, I don’t really have much time to continue development, so for now, this is the last stable version.