You can find here a lot of materials, download them absolutely freely and even get an addon to import anyone directly to Blender.
Currently we are in proccess of migration to new website.
Part of features are not available now (registration, addon API and other).
But all database of materials is still awailable to downloading.
Addon and its API currently is not available.
Because of a lot of different changes came to Blender, we're looking for new concepts of using this addon
Because of migration we're looking for new people who shares our ideas and ready to join this project.
Now we have two major task to improve Blendermada