[Question2Answer][Q2A] (Q2A) is a popular free open source Q&A platform for PHP/MySQL, used by over [22,000 sites in 40 languages][3].
Q2A is highly customisable with many awesome features:
## Key features
- Asking and answering questions (duh!)
- Voting, comments, best answer selection, follow-on and closed questions.
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- Create experts, editors, moderators and admins.
- Fast integrated search engine, plus checking for similar questions when asking.
- Categories (up to 4 levels deep) and/or tagging.
- Easy styling with CSS themes.
- Supports translation into any language.
- Easy styling with [CSS themes][6].
- Supports [translation][7] into any language.
- Custom sidebar, widgets, pages and links.
- SEO features such as neat URLs, microformats and XML Sitemaps.
- RSS, email notifications and personal news feeds.
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- Beat spam with captchas, rate-limiting, moderation and/or flagging.
- Block users, IP addresses, and censor words
Q2A also features an extensive plugin system:
## Plugins
Q2A also features an extensive [plugin system][5]:
- Modify the HTML output for a page with *layers*.
- Add custom pages to a Q2A site with *page modules*.
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- Add extra spam protection with *captcha modules*.
- Extend many core Q2A functions using *function overrides*.
Q2A themes, plugins and language files created by other members are [available here][8].
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Development is now taking place through GitHub. The collaborative development process is being managed by [Scott Vivian][1]. Official releases can be found either on the [Q2A website][Q2A] or via the Releases tab on GitHub.
Please read the [contributing page][2] for more information on how to get involved.
## Development
Thanks and enjoy!
Question2Answer is open source and we welcome contributions! The collaborative development process is being managed by [Scott Vivian][1]. Please read the [contributing page][2] for more information on how to get involved. We also have an [active community][4] where you can ask for help and discuss Q2A with other members.
Gideon
Official releases can be found either on the [Q2A website][Q2A] or via the Releases tab on GitHub.
