Mathematics
Q&A for people studying math at any level and professionals in related fields
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games
MathOverflow
Q&A for professional mathematicians
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Stack Overflow
Q&A for professional and enthusiast programmers
Proof Assistants
Q&A for mathematicians and computer scientists who develop and use proof assistants