Best open-source alternatives to Reddit

Discourse is an open-source community platform designed for people who want to host their own discussion spaces with full control over infrastructure and configuration. It is positioned as a forum and community hub, with official hosted service available for teams that prefer not to manage servers themselves. The platform supports core community features such as discussion topics, real-time chat, themes, and plugins, making it suitable for public forums, support communities, and other collaborative spaces. The README also highlights a long-running ecosystem, documentation for development and setup, and a RESTful Rails-backed API, indicating a mature web application built for extensibility and self-hosting.

Lemmy is a self-hostable link aggregator and discussion forum designed as a decentralized alternative to Reddit. It runs as part of the fediverse, so servers can federate with one another and users on one instance can subscribe to communities and participate in discussions across other instances. The project is aimed at communities that want control over their own moderation policy and infrastructure without relying on a corporate platform. It emphasizes ease of deployment, mobile-friendly interaction, and moderation features such as admin roles, community moderators, and tools for locking, removing, banning, and transferring communities and users. It also includes conveniences like live-updating threads, tagging, notifications, image uploads, and RSS/Atom feeds.

Misago is a forum software project aimed at running modern, feature-rich online communities. It is positioned as a complete forum solution and includes a broad set of community management capabilities such as user accounts, profiles, moderation, permissions, private threads, polls, and customizable profile fields. The README shows that the project is intended both for production deployments and for local development. It supports OAuth-based sign-in with many providers, includes an admin control panel, and exposes an OAuth2 client plus JSON API for integration with external sites. The development workflow is Docker-based, with separate containers and dependencies, and the project also includes frontend and admin asset build steps for customizing the interface.

Flarum is a forum and discussion platform intended for websites and online communities. It emphasizes a lightweight, modern interface and a straightforward user experience, positioning itself as software that is easy to deploy and pleasant to use for both administrators and community members. The project is aimed at people who want to run a successful community with minimal clutter while still retaining flexibility. Its architecture is described as extensible, with a powerful Extension API for customization and integration. The README also points users to installation and support documentation, indicating that the project is meant to be self-hosted and actively configured by site operators.

NodeBB is a forum platform built on Node.js for communities that want modern, real-time discussion features while preserving the familiar bulletin-board structure. It is designed for developers and community operators who need a self-hosted discussion system with plugins, theming, and support for multiple database backends. The project emphasizes live interactions through web sockets, real-time notifications, and a read/write REST API. It also supports local user accounts, category-based organization, and asynchronous messaging, and it can be extended through third-party plugins and customized with themes and SCSS/CSS.

MyBB is an open source forum platform aimed at communities that want to run their own discussion board. It is written in PHP and supports several common database backends, including MySQL, MariaDB, PostgreSQL, and SQLite, making it suitable for a range of self-hosted setups. The project is intended for administrators and community operators who need a production-ready forum system with extensibility. The README points users to downloadable releases, documentation, plugins, themes, translations, and support resources, indicating that the software is designed to be customized and maintained as a long-term community forum.

phpBB is an open-source bulletin board platform written in PHP. It is intended for communities that need a forum-style discussion system, with the README pointing users to phpBB.com for copies, support, and community discussion. The project also includes an active development community and contribution workflow for people who want to help improve the software. The README focuses more on development and contribution than end-user features. It describes how to set up a development build from the repository, including cloning the source and installing dependencies with Composer. It also references Vagrant and GitHub Codespaces for development environments, and it links to development documentation and automated testing resources. The GPLv2 license indicates a fully open-source commercial model.

Talkyard is a self-hostable discussion platform designed for online communities, workplaces, schools, and support forums. It combines several interaction styles in one product, including traditional forum threads, StackOverflow-style question and answer topics, Slack-like chat channels, and embedded blog comments. The project emphasizes structured conversation and discoverability: good comments can rise to the top, users can upvote ideas, and discussions can include tags with values, disagreement signals, and recent-reply navigation for large threads. It also supports anonymous posting for sensitive questions or feedback. The README points to a demo, documentation, and a separate production/self-hosting repository, suggesting it is intended for deployment by operators who want a community platform under their own control.

Simple Machines Forum (SMF) is a web forum platform used to create and manage online discussion communities. The repository described in the README is the development source for the project rather than a packaged end-user distribution, and it points users to official releases and installation guidance on the project wiki. The README is oriented toward developers and contributors. It explains how to prepare a source checkout with Composer, how to update dependencies during development, and how to contribute changes via forks and pull requests. It also notes the active release branches and provides a link for security issue reporting. The project is licensed under BSD 3-clause, indicating an open and permissive commercial model.

A link aggregator / reddit clone for the fediverse (alternative to Reddit).