Disqus!

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 .

Gossip Comments (the name might change) is a simple, free commenting system with moderation panel.

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:

HTML Comment Box is an easy wasy for your website to receive, and optionally approve/delete comments from your visitors.Just paste the html comment box code near the bottom of your web page's HTML source, and voila!

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

Spirit is a modern discussion platform.

Pubble is the world's best Q&A platform. We make it simple and easy to add a great Q&A platform to any blog, website or Facebook page.

IntenseDebate is the premier commenting system available on the Internet for blogs and websites. IntenseDebate comments enhances and encourages conversation on your blog or website. With IntenseDebate you can give your blog readers the opportunity to better engage your blogs content and each other. ID offers numerous features that makes improves the commenting experience, like our Reply By Email functionality which enables you to reply to and moderate comments via email!

Almost every business owns a website these days. However, few of them are able to engage their visitors. We provide a solution. A comment widget with a strong focus on customizability, privacy and a modern look.

Customizable Comments For Your Site. It comes with beautiful themes.You can 100% customize its looks though and no iframes needed. No coding or databases needed either, thus great for static sites.

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.