Try the brand's mill ERP it is seamlessly integrated with Google Apps adding a Google shared Drive for work to store process related documents in a predefined folder structure. This enables your Team to organize Google Drive Documents in a collaborative organized manner. Also all brand's mill CRM contacts "Leads, Customers, Partners,..." may be bidirectional synced with Google Contacts on all mobile devices. Add brand´s mill ERP from the Chrome Web Store to your domain to see how SSO within Google Apps works.
You may Administrate all Markteplace Apps from your Apps Domain Admin Console: Apps/Marketplace-Apps .