Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Mathematics
Q&A for people studying math at any level and professionals in related fields
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Stack Overflow
Q&A for professional and enthusiast programmers
Politics
Q&A for people interested in governments, policies, and political processes
Biblical Hermeneutics
Q&A for professors, theologians, and those interested in exegetical analysis of biblical texts
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more