On OS X, there is MacUpdate. Not curated, but user-unfettered. There used to be another very similar one, called VersionTracker, which was much more popular...

On OS X, there is MacUpdate. Not curated, but user-unfettered. There used to be another very similar one, called VersionTracker, which was much more popular... and then it was acquired by CNET. And everybody gradually stopped using it. There's probably some kind of lesson hiding in there somewhere...