Ask HN: Best software for a focused HN-like site?

I looked at Pligg and Drigg but they both seem like they suck. Features I'm most interested in: - Simplicity - OpenID and/or Disqus integration - Easy of management (spam removal, banning users, etc) - Some kind of spam prevention...recaptcha, etc.

Why: I'm making a focused news site and I figured that it'd be great to let users submit things too. It'd be relating to free-speech / net neutrality topics, or anything related (personal freedoms, world news where applicable, etc)

I'm decent at PHP and I've written a few useful things in Python, but I don't really know Django and there has to already be something out there that does this. What software does HN use? Is THAT open source?