Quantcast Measure - Quantcast Measure provides free cross-platform audience measurement for a mobile app, website, network or platform.

IntenseDebate - IntenseDebate's comment system enhances and encourages conversation on your blog or website.

Affinio - Affinio is an advanced marketing intelligence platform that leverages the interest graph to understand today’s consumers.

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