CentreStack is an Enterprise File Sync, Share, and Collaboration platform. It allows organizations to integrate their existing Active Directory infrastructure and file servers. Users can then access that data from anywhere using any device over public internet without the need to connect via SSL VPN.
CentreStack also support multiple forest and multiple domain integration. It allows importing AD users and Groups from different domains and provide access to users in different domains.
Please take a look at this video to see how to integrate AD into CentreStack and import users and groups:
To learn more, please visit http://www.centrestack.com/