Basilicus: Worldbuilding Wiki
A science fiction worldbuilding wiki.
Criar Mundos - Building Worlds
A step-by-step guide for creating original settings and incorporating realistic details. Various resources and references. In English and Portuguese.
Rich Staats' RPG / World Building Articles
Many interesting original and adapted articles of all aspects of gaming worlds, with much of interest to world builders.
The Fantasy World Builders Forum
A forum for fantasy world builders with supplement site.
A web-based application that creates generic random events for a nation or region. The user can specify the starting year, number of years, and events per year.
Indexed links reviewed for their relevance to gamemasters. With additional information on conlangs, fantasy names, and fictional religions.