I'm a postdoctoral researcher in operating systems (see my website for details and publication list) and use C, C++, and Python regularly for my work.
I also put up some of my stuff on Github.
Q&A for professional and enthusiast programmers
Q&A for computer enthusiasts and power users
Q&A for Ubuntu users and developers
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for power users of Apple hardware and software
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for professional programmers interested in conceptual questions about software development
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Stack Exchange Network staging zone, where users come together to build new Q&A sites