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Disqus is the web’s most popular discussion system. It's a global comment system that improves discussion on websites and connects conversations across the web.

Isso – Ich schrei sonst – is a lightweight commenting server written in Python and JavaScript. It aims to be a drop-in replacement for Disqus.

HashOver is a PHP comment system intended as a replacement for services like Disqus. HashOver is free and open source software, under the GNU Affero General Public License. HashOver adds a "comment section" to any website, by placing a few simple lines of JavaScript or PHP to the source code of any webpage. HashOver is a self-hosted system and allows completely anonymous comments to be posted, the only required information is the comment itself.

talkatv is an open source comment service much like Disqus or IntenseDebate .

A commenting server similar to Disqus and IntenseDebate

Commentar is a self hosted open source commenting system which can easily be integrated into any existing system. It is a modular system and some features that will be implemented are:

Commentics is an advanced PHP comment script with many features. Its main aims are to be integrable, customizable and secure. It is designed to be integrated into your existing pages.

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

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

Spirit is a modern discussion platform.

RbComment - Zend Framework 2 module for drop-in, self-hosted comments, with email notifications, Akismet, ZfcUser and Gravatar integration.

coComment is a service for managing, powering and researching conversations online. When using coComment, you can keep track of your comments across any site, share them with friends, and get notified when you get a response.

The complete discussion system for your siteMuut powers lively discussions for tens of thousands of sites, making users happier and more likely to return.

Livefyre is an embeddable real-time commenting platform that turns comments on any site into live conversations, increases the quality of those conversations, and drives traffic to content around the web.

Epoch is a new plugin from the creators of Postmatic. The goal: To provide a realtime commenting/chat experience using fully native comments while being compatible with page caching, cdns, mobile, other comment plugins, and seo best practices. A tall order? For sure. Try it out.