eXo Platform Enterprise is an enterprise-grade social collaboration platform. It integrates wikis, forums, calendars and document management tools with activity streams and workspaces, enabling business users to instantly connect and collaborate on multiple projects in a frictionless environment.
Native iPhone, iPad, and Android apps simplify on-the-move collaboration, and the platform’s open source code and standard APIs maximize flexibility and extensibility for custom business requirements.

Try online by joining the community at http://community.exoplatform.com