Community Builder

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BuddyPress

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.

Discourse is an open source internet forum and mailing list software. The application is written with Ember.js and Ruby on Rails, and can be self-hosted in the cloud or on local hardware for free. Discourse also provides managed hosting starting at $100/month, so that you can focus on building a community rather than installing software and managing servers.

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.

A next generation user profile and social networking plugin for WordPress. PeepSo allows you to quickly and effortlessly create a social network and online community with you WordPress-powered site. The foundation of PeepSo is 100% free and gives you the basics to create a functional community. For more advanced features, there is a extensions ecosystem for both free and premium plugins that can be used to add more functionality and features to your site.

MemberPress is a premium WordPress plugin that allows you to instantly start charging your users for access to your content. The MemberPress plugin integrates with the most common payment provides and third-party services.

Ultimate Member is a WordPress plugin offers a wide range of features including user profiles, member directories, user registration and login, user role editing, content restriction.