I want to know which is the most widely used and best supported Question and Answer Plugin for WordPress.

I strongly prefer open source and good database structure. I don't mind paying for a Pro license. These are my top criteria for this question:

  • Stack Exchange clone (as close to SE features as possible, including reputation system)
  • Widely used by WordPress community
  • Works with various WP Themes and other WP Plugins. (Not all do. Example: Discy)

The options I have identified so far include:

There are probably many others.

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