Open-source alternatives to Thredded

NodeBB is a real-time, self-hosted community forum platform built on Node.js. It is designed to support scalable discussion environments by utilizing a document-oriented database for content storage and an in-memory engine for high-speed data retrieval and session management. The platform provides a comprehensive administrative interface for managing user groups, forum settings, and system health. What distinguishes the platform is its native support for federated social networking via the ActivityPub protocol, allowing forums to exchange content, synchronize discussions, and interact with de

Misago is fully featured modern forum application that is fast, scalable and responsive.

Misskey is a self-hosted, decentralized microblogging platform and federated social media server. It functions as a distributed content management system that allows users to communicate across multiple independent and interconnected server instances using the ActivityPub protocol. The platform distinguishes itself with a dynamic application engine that allows for the creation of interactive applications and custom page layouts using a scripting language. It also features a specialized markup language for rich text rendering, enabling the use of animations and custom styles for consistent con

Q&A-based community knowledge-sharing software

Libreddit is a privacy-focused Reddit client and front-end that acts as a privacy-preserving web proxy. It provides a lightweight web interface for viewing Reddit threads and media through an intermediary server to prevent the original platform from tracking user activity and identity. The project removes advertisements, tracking scripts, and JavaScript execution to enable ad-free content consumption and JavaScript-free web browsing. It utilizes server-side proxying and media proxying to fetch content and re-serve images and videos, masking the user's IP address from the external platform. T

Mastodon is a self-hosted, decentralized social networking platform that functions as a microblogging application. It enables independent server instances to communicate and exchange social data through the standardized ActivityPub protocol, allowing users to participate in a global, interoperable network. The platform distinguishes itself through its federated architecture, which grants administrators full control over their community instances. This includes comprehensive tools for user moderation, account management, and the enforcement of community guidelines. The system is designed to ha

Anahita is a platform and framework for developing open science and knowledge sharing applications on a social networking foundation.

phpBB Development: phpBB is a popular open-source bulletin board written in PHP. This repository also contains the history of version 2.

BuddyPress DEVELOPMENT repo. This repository is just a mirror of the development SVN at https://buddypress.svn.wordpress.org/. Please include a link to a pre-existing ticket on https://buddypress.trac.wordpress.org/ with every pull request.

Pixelfed is a decentralized, self-hosted photo sharing platform and social network. It uses the ActivityPub protocol to enable federation, allowing independent server instances to share user profiles, media, and posts across a distributed network. The platform distinguishes itself with a focus on media portability and processing, featuring tools for importing content from Instagram and utilizing client-side WebGL for image filter processing. It employs a driver-based storage abstraction to manage media across local disks or S3-compatible cloud object storage. The system includes capabilities

A social networking engine in PHP/MySQL

A federated social home

A reddit-like content aggregator and micro-blogging platform for the fediverse.

The Stack Overflow clone for your team (self-hosted or hosted)

Flarum is a PHP-based community forum software designed for building and managing structured online discussion spaces. It functions as a self-hosted discussion forum and threaded discussion engine, providing a platform for users to create and participate in community conversations. The platform is designed as an extensible community platform, allowing for customizable forum development through the use of custom extenders to modify system behavior and features. The system includes capabilities for online community management and forum hosting, supported by a console interface for executing ad

A better commenting experience from Vox Media

Loomio is a collaborative decision making tool

Friendica Communications Platform

An ActivityPub/Fediverse server

MyBB is a free and open source forum software.

💬 A privacy-friendly and customizable Disqus (comment system) alternate. 注重隐私保护和定制化的评论系统。

ENiGMA½ BBS Software

Lemmy is a self-hosted, federated discussion platform that enables the operation of independent, decentralized social networking servers. By implementing the ActivityPub protocol, it allows autonomous instances to exchange content, synchronize user interactions, and participate in a global, distributed network without centralized control. The platform distinguishes itself through a decoupled architecture that separates the backend API from the frontend, facilitating the development of custom interfaces while maintaining unified user handles and cross-platform communication. It provides granul

HumHub is an open-source enterprise social networking framework designed to facilitate internal communication and team collaboration within private organizational networks. It provides a modular architecture that allows organizations to build secure, self-hosted digital workspaces where users can manage profiles, share content, and organize projects through dedicated collaborative spaces. The platform distinguishes itself through a highly extensible plugin system and a granular role-based access control model. By utilizing an event-driven hook system and a modular architecture, developers can

Simple Machines Forum — SMF in short — is free and open-source community forum software, delivering professional grade features in a package that allows you to set up your own online community within minutes!