Google Drive - Access and sync your files anywhere
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
ShareFile - Secure file sharing and sync
MailClark - The Slack bot for external communications
Dropbox - Online Sync and File Sharing
Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates