Criar Mundos - Building Worlds: A step-by-step guide for creating original settings and incorporating realistic details. Various resources and references. In English and Portugese.
Fantasy World Building: Step-by-step tutorial for setting design, based on establishing a "world vision" for its cultural/geographic regions.
Guidelines For Creating Magic Systems: Compiled suggestions and discussions about the design of magic systems for roleplaying games and literature. Applicable to all genres.
Magical World Builder's Guide: Suggestions for creating consistent magic themes for fantasy settings, as well as general world building advice and resources.
Patricia C. Wrede's Worldbuilder Questions: Advice on creating a believable fantasy world, with a particular eye toward crucial yet easily overlooked details.
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.
Timeline Generator: 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.
World Builder Projects: Starting place for information on how to build an imaginary setting.
World Builders: A website supporting a world building distance education course. Reference material, lessons, downloads, and sample worlds.
World Building: An example of designing a planet, from basic physical assumptions to geography to weather systems and archeological remains.
World Building: Contains mainly links to world design related articles and pointers to interesting sites.
Worldbuilding: Indexed links reviewed for their relevance to gamemasters. With additional information on conlangs, fantasy names, and fictional religions.