Open source Disqus clone for static websites
schnack is an awesome, ad-free, open source Disqus clone that comes with a very minimal, hackable code base.
MyTwoCents Comment Aggregator
Shows relevant Reddit/HN/FB comments while you surf the web
MyTwoCents Comment Aggregator is a browser extension that puts the relevant Reddit, HackerNews and Facebook comments (for now) on any website with the push of a button. It also shows the number of comments available for the current site on the extension icon in the browser.