IntenseDebate

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

CommentLuv

CommentLuv provides plugin that enables readers to post their comments.

Commentbox is a jsf component that allows quick realization of a comment functionality

Commentics is an advanced PHP comment script with many features.

A fast, bloat-free comments system to foster discussion on your website

Disqus is a global comment system that improves discussion on websites and connects conversations across the web.

Facebook comments plugin lets people comment on content on the site using their Facebook account.

Add modern discussion and social interactions to your website

Isso – Ich schrei sonst – is a lightweight commenting server written in Python and JavaScript.

JLex Comment is a comment system for Joomla.

Easy to set up, ad-free and reliable comment system

LiveRe provides comment management and content response solutions.

Metype is a complete engagement solution.

Padlet Briefcase provides a virtual canvas for team collaboration that can be used for venn diagram, discussion board or for a business plan

Remarkbox offers a free comment system to keep readers engaged with your content.

Viafoura is an easy-to-integrate social monetization platform that enables your to better engage, understand and monetize your community.

coComment is a service for managing, powering and researching conversations online.

talkatv is an open source comment service much like …