Opensource CMS site with points, profile page and approval

What Opensource CMS frameworks in any language (PHP,.net,java) are 开发者_StackOverflow中文版there, wherein the users are the contributors to the site? The users can submit articles which will then be reviewed by an admin for publishing. The writers will also have there own profile page and reputation points.

Examples:

1. Think of it as Stackoverflow but for articles and your posts has to be approved by an admin first.

2. CodeProject

You can do it using Drupal with little bit customizations.