GMare allows for 4 different types of exporting. Export to a GM project file (GM 5 to 8 ), a custom .bin or .txt file, or a .png image file.
For GM project export it allows for instances with creation code to be placed just like GM. It also has a list of all the instances created within the room, that can be grouped by alphabet, id, or by object type. It also has a collision tool that allows for basic triangles or squares to be placed. (However collision data can only be exported to a .bin or .txt file.)
GMare still supports .ore files, and also makes rooms from .gif, .bmp. and .png files.