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Looks like the best fit in this thread.

The demo site says that it's IE10+ only. This is a non-starter for me unfortunately.

This looks promising.

I don't need a login system, so it's fine, but I think it is lacking author urls, isn't it?

Not sure what you mean. Isso does not authorize authors, hence an author URL does not necessarily list comments actually posted by author xyz.

Perhaps needs a good spam filter? Login system like Disqus provides?

Great!