Community Builder

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YaBB

Invision Community is a leading platform for building vibrant communities with forums, eCommerce, content management, image galleries and more. With Invision Community, you can increase your brand or business customer loyalty, reduce support costs and drive sales by building a vibrant online community.

GNU social connects you to a free network of thousands of communities that discuss daily on a variety of topics, each being part of the whole. GNU social supports both single-user and community modes and can be used in an intranet environment or as part of the wider open network. The free and open source microblogging server is written in PHP and built on-top of the OStatus standard for inter-operation between installations.

A flexible WordPress plugin for building online communities, teams, and groups with WordPress-powered sites.

One of the world most popular, free, open-source and self-hosted forum software, written in PHP. With phpBB you can create communities that can be hosted with most hosting providers. The software package is built and designed from the ground up to to be extensible and provides customization option through themes and feature extensions through plugins. The extensive database of user-created extensions and styles database, easy of use, and the simple installation process has made phpBB a common choice among self-hosted forums and communities.

LayerBB is a small yet feature rich, free and open-source community software written in PHP. LayerBB enables you to quickly and easily start your own community while providing great flexibility and customisability.

A free and open-source modern forum software written in PHP. With Flarum you can eaisly setup your own discussion froum and host it online.