It allows you to build monsters/NPC's from scratch using the GmG rules. It also allows you to edit most aspects of monsters and NPC's.
It also has support for Hazards.
From what I can see, all of the NPC's from GM guide are in their and core Hazards. Add on the Bestiary and you will get all of the monsters from there as well.
All in all, it is a great resource for a GM.
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