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Stack Overflow is a free, community-driven, reputation-based Q & A site for computer programmers. No membership is required to ask questions or provide answers to questions by others. Registered users...

Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse topics from software programming to cooking to photography and gaming. We are an expert …

Quora.com is a question/answer service allowing users to pose questions that other users can answer, each question and answer can have comments, each users can write one individual answer and …

Super User is a Q&A site for computer enthusiasts that's free. Free to ask questions, free to answer questions, free to read, free to index, built with plain old HTML, …

Server Fault is a Q&A site for system administrators and IT professionals that's free. Free to ask questions, free to answer questions, free to read, free to index, built with …

Question and answer service based on user profiles and a user score. Questions can be answered via the web page or via IM integration.

Amazon's Askville is a community where people love helping others by answering questions.

Answers is the place to go to ask questions and receive answers from the community at large on any topic. Connect with people who know the answers to your questions …

Тостер - онлайн сервис вопросов и ответов с открытой регистрацией. На «Тостере» можно получить ответ на вопрос по любой теме IT от участников сообщества, хорошо разбирающихся в этой теме.