I use Windows on workstation and FreeBSD on server.
Recently dipped myself into the mobile app world.
Q&A for professional and enthusiast programmers
Q&A for professional programmers interested in conceptual questions about software development
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Japanese language
Q&A for system and network administrators
Q&A for science fiction and fantasy enthusiasts
Q&A for meta-discussion of the Stack Exchange family of Q&A websites