For questions seeking resources intended to help people with building a fictional world, such as books and software relating to worldbuilding itself (rather than the world that is being built). Consider also [software-recommendations]. Not for use for questions on natural resources within a fictional world; use [natural-resources] instead.
This is one of the meta-level tags, and is specifically concerned with questions about books and technological aids to be used for hastening the process of designing and fleshing out your story-setting to make it as beautiful, believable and engrossing as possible. See also the software-recommendations, geography, map-making, and worldbuilding-process tags.