These are some links very useful for the material presented. For an italian list you must go back and enter in the italian section.
The only one official site of Ravenloft. it contains netbooks, adventures, and a bunch of other links
A lot of maps from the Demiplane of Dread (you can use it for your campaigns)
One of the biggest resources on the web. The archives contain a lot of useful material for a DM
A long excursus about written, languages (real or not) and how you can import them in your fantasy world. A lot of Fonts also!
This is your starting point to know all about the father of modern fantasy
Beautiful site, developed by a lot of writters of TSR.
In this huge archive you can find hundreds of resources free to download (some link doesn't work properly)
Irony software develops programs for the DM. You can find generators of ALL: houses, Dungeons, Maps, treasures...
This is the site of one of the ancient magazines of RPG. In Franch.
A lot of free material and useful links
A beautiful site with stories, adventure plots, and a nice graphic, even if too heavy. For franch talkers.
All you want to know about Grayhawk, the gem of the Flanaess is here
A very interesting site, full of resources for the DM. The most of the resources works only online
A site about Middle-Earth that is a neverendig well about the topic. Yaou can do searches by keywords or by topic.
These are the official sites supported by Wizards of the Coast. These campaigns are off production but you can find upgraded material even from their creators.