Apache Answer

Apache Answer is an Apache Software Foundation project — a self-hosted Q&A platform software licensed under Apache 2.0. It covers the same ground as Stack Overflow and Quora, but as software you host and control: public community forums, private help centers, and internal knowledge bases for teams of any size.

The user experience mirrors what people know from Stack Overflow: questions and answers with Markdown side-by-side preview, upvotes and downvotes, a reputation system that unlocks privileges, tag-based organization, real-time question suggestions while typing, and advanced search with filters for tag, user, and score. Community management features include admin, moderator, and user roles, bulk user creation, wiki-style collaborative editing with a transparent revision history, and content access control that restricts certain content to signed-in members.

Answer emphasizes extensibility and security. A plugin ecosystem adds OAuth2 and third-party login connectors (Google, DingTalk, generic OAuth2), CAPTCHA and Akismet anti-spam, external search engines (MeiliSearch, Elasticsearch, Algolia), object storage via S3, CDN caching, and Slack or DingTalk notifications. Registration and login behavior can be restricted by allowed email domains. The UI is multilingual, responsive, and ships with dark mode.

Unlike Stack Overflow Enterprise or Quora, Answer charges nothing: there is no subscription tier or seat licensing. You deploy it with Docker Compose, connect it to SQLite, PostgreSQL, or MySQL, and own all data and branding.