I am looking to launch a site like Reddit/Digg/Hacker News internally in my company that lets people submit links, vote on them, and discuss them. The feature set doesn't need to be any more complex than Hacker News. I am looking for an existing platform that can do this and satisfies the following requirements:
Does such a tool exist? Reddit is open source, but licensed under the viral CPAL. News.arc, which powers Hacker News, seems to have a more appropriate license (Perl Artistic License), but it is written in the arcane Arc language, which calls into question points 2 and 3.
Three things come to mind: Slashcode (which powers slashdot), Metaphilter (which runs MonkeyFilter, a MetaFilter clone) and Scoop (which runs Kuro5hin).
Slashcode does not claim to work on Windows, and I'm unable to find the documentation for the others.
As for licensing, as far as I know, they're all under FOSS licenses.
Hopefully this should serve as a starting point.
Note: The site for Scoop seems to have no content right now.