Google Drive - Access and sync your files anywhere
V12 Data - V12 Data offers rich data sets with verified addresses and emails for personalized marketing campaigns.
ShareFile - Secure file sharing and sync
Adobe Audience Manager - Adobe Audience Manager is a data management platform that integrates online and offline data to deliver a unified view of all your audiences
Dropbox - Online Sync and File Sharing
Google Audience Center - 3 votes and 6 comments so far on Reddit