Remarkbox

IntenseDebate is a feature-rich comment system for WordPress, Blogger, Tumblr and many other blogging/CMS platforms. Enable your users to see who they're debating with. Rich profiles and the ability to connect with people make IntenseDebate a very useful widget. IntenseDebate email notifications alert you and your readers of new comments, encouraging return visits and additional comments. You can reply to and moderate comments via email, while threading makes it easy to follow the conversation. Auto-delete comments by keyword, email, and IP addresses, or ban users from posting. Akismet keeps the spam at bay. Assign additional admins to manage the same blog/website. Auto-filter comments by keyword, email, and IP addresses. Let your readers post comments using services like Facebook and Twitter. They can also sign up for an IntenseDebate profile or simply comment without one as a Guest.

The HyperComments system, hosted and powered by hypercomments.com, makes for meaningful context remarks, nested and topicated respectively to facilitate further discussions. Logical breakdown of both standard and HyperComments is inviting to a reader, provide a larger scope, better readability – helping one to make sense of it all, nothing short of your conversational counterpart 'mind-reading'. HyperComments is featuring: In-depth interaction with text; Topicated comments miscellanea; Real-time visibility of 'same page' readers, real-time survey of responses to your comments; Tree-structure and nesting view of comments; Powerful moderation and administration tools across the board; Full spam filtering, blacklists and whitelists, removing, restoring, moderator-responses; Analytics, breakdown of Hype