SocialEngine is PHP community software that helps you build your own custom social network website. Features include blogs, photo albums, user groups and forums.
Many available extensions or plugins available. Custom programming may not be necessary.
Management of content and data is relatively straight forward, but there may be a bit of a learning curve. Some programming experience may be required.
Has a larger active community. Support is always available for free or as a paid service. Excellent documentation available.
An open source lightweight flat-file content management system for the brutalist web design trend.