Commento - A lightweight, open-source, privacy-focussed comment engine alternative to Disqus.

•    Go

Commento is a comment engine. You can embed it on your blog, news articles, and any place where you want your readers to add comments. It's lightweight and simple, allowing for lightning fast page loads. It's privacy-focused because that's the way comment engines should be. Embedding comments on your blog on why Vim is the greatest editor shouldn't inject tons of ads and tracking scripts into your reader's browser.

HashOver 2.0 - PHP based Comment System

•    PHP

HashOver is a PHP comment system intended as a replacement for services like Disqus. 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.

Isso - a Disqus alternative

•    Python

Isso is a lightweight commenting server similar to Disqus. It allows anonymous comments, maintains identity and is simple to administrate. It uses JavaScript and cross-origin ressource sharing for easy integration into (static) websites.

talkatv - An open source commenting system

•    Python

talkatv is a comment service much like DISQUS or IntenseDebate. talkatv is embedded on any page and uses XMLHttpRequest level 2 and Cross-Origin Resource Sharing to post the comment back to the server.

Mouthful - Self-hosted alternative to Disqus

•    Go

Mouthful is a lightweight commenting server written in GO and Preact. It's a self hosted alternative to disqus that's ad free. It supports multiple database support(sqlite, mysql, postgres, dynamodb), Server side caching to prevent excessive database calls, Rate limiting, Honeypot feature, to prevent bots from posting comments, Migrations from existing commenting engines(isso, disqus) and lot more.

Juvia - A commenting server similar to Disqus and IntenseDebate

•    Ruby

Juvia is an open source commenting system. It allows you to outsource your commenting needs to an external system so that you don't have to build your own commenting system for each website or each web app. Embedding a Juvia commenting page only involves pasting a JavaScript snippet into your web page.

Talkyard - Forum software, brings together the best from StackOverflow, Discourse, Slack, Reddit, Disqus

•    Scala

Talkyard is a Forum software, brings together the best from StackOverflow, Discourse, Slack etc. It helps people find help "instantly", in Question & Answers topics, Discuss, upvote and choose the right things to do. It also provides support to do team chat, Add embedded comments to the blog.

remark - comment engine

•    Go

Remark42 is a self-hosted, lightweight, and simple (yet functional) comment engine, which doesn't spy on users. It can be embedded into blogs, articles or any other place where readers add comments. Authentication handled by external providers. You should setup oauth2 for all (or some) of them to allow users to make comments. It is not mandatory to have all of them, but at least one should be correctly configured.

Disqus Module for DotNetNuke

This is a module wrapper for the popular Disqus comment engine. This allows you to add the comments to any page, and attach the comments directly to any module on the page. Using this module, you can instantly enable the most interactive comment engine known.

Comments App - A real-time, markdown-enabled comment engine powered by leveldb with oauth support

•    Javascript

A real-time comment engine with support for anonymous or authenticated posts.

giscus - A comments system powered by GitHub Discussions

•    Typescript

A comments system powered by GitHub Discussions. Let visitors leave comments and reactions on your website via GitHub. It is heavily inspired by utterances. It does not require database, all data is stored in GitHub Discussions. It is Extensively configurable and supports Custom themes, Multiple languages.

disqus - A Ruby library for the Disqus commenting API and Javascript widgets.

•    Ruby

The Disqus Gem helps you easily integrate the Disqus commenting system into your Ruby-based website. It includes a Ruby wrapper for Disqus's REST API, and views helpers to generate their Javasript widgets. See the Disqus::Api class for more info on the Disqus API. You can also read the Disqus developer info here.

PHPNuke

•    PHP

PHP-Nuke is a Web Portal System or content management system. The goal of PHP-Nuke is to have an automated web site to distribute news and articles with users system. Each user can submit comments to discuss the articles.

talk - A better commenting experience from Vox Media

•    Javascript

Online comments are broken. Our open-source commenting platform, Talk, rethinks how moderation, comment display, and conversation function, creating the opportunity for safer, smarter discussions around your work. Read more about Talk here. Built with <3 by The Coral Project, a part of Vox Media.

disqus - A Ruby library for the Disqus commenting API and Javascript widgets.

•    Ruby

A Ruby library for the Disqus commenting API and Javascript widgets.

echo-chamber-js - Commenting without the comments

•    Javascript

Echochamber.js is a third-party script you can install to add a simple comment form to your blog post or website. Because then there'd be a chance that someone would read the comments. You might have to read those comments. You don't want that.

SharePoint Comments Anywhere

This is a very simple project which provides a commenting web part and a list template with the instance to store user's comments. SharePoint OTB only provides commenting capability on the Blog sites where users add their posts and anyone can view the page and add comments....

gitment - A comment system based on GitHub Issues.

•    Javascript

Gitment is a comment system based on GitHub Issues, which can be used in the frontend without any server-side implementation. Click here to register an OAuth application, and you will get a client ID and a client secret.

Gerrit - Code Review tool for Git

•    Java

Gerrit is a web based code review system, facilitating online code reviews for projects using the Git version control system. Gerrit makes reviews easier by showing changes in a side-by-side display, and allowing inline comments to be added by any reviewer.

lambda-comments - Blog commenting system built with AWS Lambda

•    Javascript

This project which implements a minimal blog commenting service. The Lambda functions are written in ES6, with async/await, transpiled using Babel, and bundled using Webpack.