Open-source alternatives to Phpbb

Discourse is an open-source forum engine designed to facilitate long-form threaded conversations and community management. Built as a server-side application, it provides a structured, category-based interface for interactive online communities, supporting user authentication, moderation, and real-time content delivery. The platform utilizes a relational database to manage complex relationships between users, topics, and site settings. The application distinguishes itself through a modular architecture that allows for custom plugins and themes, enabling the adaptation of discussion spaces to

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

Q/A based social network

MyBB is a free and open source forum software.

A light-weight forum

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

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

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

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

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

A federated social home

Diaspora is a federated social networking platform that allows users to run and manage self-hosted community servers, known as pods. It operates as a distributed network where independent server nodes exchange content and users using open protocols and standardized communication schemas. The platform is distinguished by its focus on decentralized identity management and privacy-preserving communication. It includes a privacy-focused media proxy that routes external assets through a local server to protect user identity and supports cross-instance account migration, allowing users to move thei

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.

A social networking engine in PHP/MySQL

An ActivityPub/Fediverse server

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

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

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

A community discussion platform: Brings together the main features from StackOverflow, Slack, Discourse, Reddit, and Disqus blog comments.

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

Friendica Communications Platform

ENiGMA½ BBS Software

A better commenting experience from Vox Media

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