Q&A Services

Stack Overflow, part of Stack Exchange, 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.

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 knowledge exchange: a place where physics researchers can ask each other about quantum...

People come to Quora to ask questions about any subject, read high quality knowledge that's personalized and relevant to them, and share their own knowledge with others. Quora is a place to share knowledge and better understand the world.

Interactive tool that makes it easy to create and host quizzes, surveys, and Q&A sessions. Ideal for educators, trainers, and speakers.

Ever had a question? Ever had an answer? Ever had knowledge to share? We believe that coming together to inquire and learn, to share knowledge and to teach each other, makes the world a better place. We also believe that Q&A communities should be free from the politics and...

Akinator the Genius can read your mind and tell you who you're thinking of by answering a few questions.

Super User, part of Stack Exchange , 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, no fake rot13 text on the home page, no...

Curious cat is a small social networking tool that allows you to connect with your followers by providing them with the appropiate tools to communicate with you.

TopAnswers is what Stack Overflow should be: focused on communities and knowledge sharing, not profit. We share some of the same aims:

AhaSlides is an interactive presentation software that boosts audience engagement with live polls, quizzes, word clouds & more. We're on a mission to save the world from sleepy meetings, boring training, and tuned-out teams—one engaging slide at a time!

Scoold is inspired by StackOverflow and implements most of its features. You can ask and answer questions, upvote and downvote posts, earn badges and reputation. Each edit creates an new revision, making it easy to follow the history of edits. Scoold is optimized for the cloud.

Repair your Mac or iPod yourself. iFixit sells parts and upgrades for your iPod, PowerBook, iBook, or MacBook with free Fixit Guides.

AnonymousOverflow allows you to view StackOverflow threads without the cluttered interface and exposing your IP address, browsing habits and other browser fingerprint data to StackOverflow.

Poll Everywhere provides text message voting and audience Q&A, straight to your PowerPoint slide. It's the easiest way to gather live responses in any venue: conferences, presentations, classrooms, radio, tv, print — everywhere.

A Q&A site helps an online community to share knowledge. No matter what your area of interest, people with questions can get super answers fast. Question2Answer is a popular Q&A solution.

solvin is a modern and friendly programming Q&A platform that aims to address the shortcomings of other similar websites (namely Stackoverflow). The information listed on solvin is up to date and its user interface and backend have been designed with modern frameworks and...

View and search all Questions.

Perch helps you turn AMAs and questions from your audience into a newsletter and easy-to-share knowledge base. With Perch, you can easily engage with your audience and share your knowledge in a simple and organized way.

An android app for questions and answers with group discussion. You can ask questions and answer questions as of your wish and need. Also, you can discuss something with others in the group chat.

Mond allows you to connect with your friends and followers through anonymous messages, ensuring a high level of security and privacy.

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 plain old HTML, no fake rot13 text on the home page, no scammy google-cloaking tactics, no...

Answers.com: Wiki Q&A combined with free online dictionary, thesaurus, and encyclopedias. Ask questions, get answers.

Q&A platform software for teams at any scale. Whether it's a community forum, help center, or knowledge management platform, you can always count on Apache Answer.

Compesh is a question and answer forum, which also has a groups and blogging feature.

Acadly helps educators boost engagement inside and outside the classroom, and record attendance at the tap of a button. It is free for higher education, and saves students thousands of dollars per semester on expensive polling app subscriptions.