Ask HN: Free domain names?

Hi. Does anyone know if there are more services similar to the likes of DotTK that offer free domain names without having to pay for them? (http://www.dot.tk/en/index.html?lang=en). Google yielded nothing, but then Google also yielded any number of coupon-code sites where affil marketers drowned any such hope of getting a domain for free. Don't get me wrong, I own my own domain portfolio, but have made a conscious effort to not buy any more domains. In the true spirit of the web, you would think there would be more alternatives to the likes of DotTK...Anyone?