Carbon-Forum - A high performance open-source forum software written in PHP

•    PHP

A high performance open-source forum software written in PHP.

Spectrum - Simple, powerful online communities

•    Javascript

Spectrum aims to be the best platform to build any kind of community online by combining the best of web 2.0 forums and real-time chat apps. With best-in-class moderation tooling, a single platform for all your communities, threaded conversations by default, community health monitoring (and much more to come), we think that we will be able to help more people start and grow the best online communities.

Helpy - Modern Mobile-First Helpdesk Application Built in Ruby

•    Ruby

A modern, open-source and multi-lingual helpdesk, including email tickets, knowledgebase and forums. All your customer communications in one place, accessible from anywhere. Its features include multi-lingual knowledgebase, community discussions and private tickets integrated with email and lot more.

Vanilla forums - customizable discussion forum with mobile support

•    PHP

Vanilla is a powerful community publishing platform, and it comes with a great set of features. It has add-ons to embed your vanilla forums in to any of the site with single line of code. User will be allowed to login with their Facebook, Twitter, Google and OpenID account.

mvcforum - MVCForum is a fully featured responsive and themeable ASP

•    Javascript

MVCForum is a fully featured and themeable enterprise level ASP.NET MVC 5 discussion board/forum. The software has features similar to that seen on StackOverFlow plus LOTS more (See list below). Along with MVC it’s built using Unity & Entity Framework 6 code first and is super easy to extend and add your own features.

chatter - Chatter is a Simple Laravel Forum Package

•    PHP

Quick tip: Make sure that you've created a database and added your database credentials in your .env file.

Symphony - A modern community (forum/BBS/SNS/blog) platform written in Java

•    Java

Symphony is a modern community platform. It implements a content oriented discussion forum. It includes a social network for users to share, make friends, and play games. It has the ability to aggregate independent bloggers, to build and share quality resources.

Active Forums for DotNetNuke CMS

•    DotNet

Active Forums for DotNetNuke CMS

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.

NoNonsenseForum - A free, open source, PHP-based simple discussion forum

•    PHP

A free, open source, PHP-based simple discussion forum. It favours removing barriers to conversation rather than massaging egos. Download Here: https://github.com/Kroc/NoNonsenseForum/archive/master.zip

yii2-podium - Yii 2 forum module project

•    PHP

This extension allows you to add forum to your app.Follow instructions at Podium wiki.

Elkarte - ElkArte Forum. A free, open source, PHP-based discussion forum.

•    PHP

This is the ElkArte repository.ElkArte is a modern, free, powerful community building forum software. It is completely free and licensed with an open source BSD 3-clause license.

refire-forum - Serverless discussion forum built with React, Redux and Firebase

•    Javascript

Serverless discussion forum built with React, Redux and Firebase using refire and refire-app.Base UI components are from excellent Elemental UI.

converse - Experimental discussion forum built with Maki.

•    Javascript

A prototype discussion forum built on Maki.

flowchat - A live updating, threaded discussion platform with range voting.

•    Java

FlowChat is an open-source, self-hostable, live-updating discussion platform, featuring communities, discussions with threaded conversations, and voting.It can act as an alternative to forums, as a private team communication platform(like slack), a content creation platform(like reddit), or a voting/polling platform like referendum.

dillo - Free and open web platform created to support crowd-driven content.

•    Python

Dillo 2.0 is an extension of the Pillar framework.See it in action on Blender.Today.

simple_discussion - A simple, extensible Rails forum

•    Ruby

SimpleDiscussion is a Rails forum gem extracting the forum from GoRails. It includes categories, simple moderation, the ability to mark threads as solved, and more.Out of the box, SimpleDiscussion comes with styling for Boostrap v4 but you're free to customize the UI as much as you like by installing the views and tweaking the HTML.

nodediscuss - 基于 Node.js 的社区系统。

•    Javascript

基于 Node.js 的开源社区系统

diskuto - An embeddable comment engine

•    D

An embeddable comment engine

liberapay.org - Home of the non-profit organization that runs liberapay.com

This is the home of the non-profit organization that runs liberapay.com. The current bylaws and rules of procedure are in the en/ directory. The official French versions are in the the fr/ directory.