Commentar

Commentar is a self hosted open source commenting system which can easily be integrated into any…

Commentics

Commentics is an advanced PHP comment script with many features.

Commento

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

DISQUS

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

Discourse

Discourse is an open source discussion platform built for the next decade of the Internet.

Echo

Golang HTTP server framework

Facebook Comments

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

HTML Comment Box

HTML Comment Box widget for your website. Copy the HTML code and it just works!

HootSuite

Enhance your social media management with Hootsuite, the leading social media dashboard. Manage multiple networks and profiles and measure your campaign results.

IntenseDebate

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

Isso

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

JustComments

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

Juvia

A commenting server similar to Disqus and IntenseDebate

Master Comments System

Master Comments System is a very compact comments system with basic options:

Metype

Metype is a complete engagement solution.

Pubble

Pubble is a community engagement platform that brings the social web to your site. Change how you interact with your audience while continually enhancing your web site.

RbComment

RbComment - Zend Framework 2 module for drop-in, self-hosted comments, with email notifications…

coComment

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

jskomment

jskomment is an open source commenting system that is built on javascript and AJAX.