Are you looking for something hosted by another organization? I'd say just use the old version of Reddit from when it was still open source as long as you're wi

Are you looking for something hosted by another organization? I'd say just use the old version of Reddit from when it was still open source as long as you're willing to self-host (https://github.com/reddit-archive/reddit/wiki/Install-guide https://github.com/reddit-archive/reddit/wiki/Install-guide). I believe that is what Less Wrong originally did. The features that Reddit has added since don't seem useful to me anyway.