Crabgrass is social networking, group collaboration, and network organizing Web application. It consists of a solid suite of group collaboration tools such as private wikis, task lists, a file repository, and decision making tools.
Family-focused free software
Welcome to : http://www.tinyhomeutil.com/ This product (Homedisk) is a multi-user system, integrates online file storage and multimedia player. Users can use it to manage family photos, videos, and music. It does not need to install. It also can be run from U-disks and portable hard drives. It allows mobile phones and tablet computers to access (including the iPhone and iPad). It supports English, Chinese, French, Russian and Spanish, the family members living in different countries can use the same system.
SocialEngine is a PHP-based social network platform that lets you create a social network on your website. Right out of the box, your social network will offer nearly all of the features found on today's wildly popular social networks.
PHP & MySQL based CMS with messenger
Full featured CMS with social features. It has limited functionality by default and can be extended with additional modules. Main focus is the integration with external and inner services such as Messenger.