Project Magma is a source for Myth plugins and information.
From the Project Magma site:
About Project Magma Magma is the essence from which new lands are eventually formed. Thus Project Magma started out as a map making group for Myth TFL, a best selling Real Time Strategy game with 3D landscapes and physics. However, before long it reshaped itself into an entity devoted to serving the Myth community through a variety of projects. We enjoy working together to make new plugins for the entire myth series, create websites to facilitate the needs of the community, and develop the code base for the myth series to ensure it recieves the support it needs.
This description does refer to Myth as a Real Time Strategy game, but most players have termed Myth and other unit point limited games as Real Time Tactical