Currently active project: The Elftoolchain Project.
Q&A for professional and enthusiast programmers
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for cartographers, geographers and GIS professionals
Q&A for theoretical computer scientists and researchers in related fields
Q&A for linguists, etymologists, and serious English language enthusiasts
Q&A for professional programmers interested in conceptual questions about software development
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for computer enthusiasts and power users
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for students and teachers of all martial arts
Q&A for users and developers of hardware and software for Raspberry Pi
Q&A for people interested in improving and participating in the patent system