bbPress : bbPress is forum software with a twist from the creators of WordPress.
bbPress

bbPress Screenshot
Overview
bbPress is forum software with a twist from the creators of WordPress. bbPress is plain and simple forum software, plain and simple. It’s easy to use, easy to administrate, fast and clean. But don’t let its simplicity deceive you; underneath the gleam, it’s got some powerful features and is highly customizable

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Features

  • Open Source, always and forever
  • Less (code) is more
  • Simplicity is a feature
  • Speed and security are the foundation of any good user experience
  • Put the user first