IntenseDebate - IntenseDebate's comment system enhances and encourages conversation on your blog or website.
UsersInsights - The Users Insights WordPress user plugin helps you manage your user data in one intuitive, beautiful and searchable place.
DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Talkwalker - Talkwalker Consumer Intelligence Platform: built for speed of insight, ease of use, and data democratization
GraphComment - Add modern discussion and social interactions to your website
Affinio - Affinio is an advanced marketing intelligence platform that leverages the interest graph to understand today’s consumers.