Dropbox - Online Sync and File Sharing

Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors

Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.

Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

WeTransfer - WeTransfer is a free service to send big or small files from A to B.

GoSquared Live Chat - Beautiful, simple, and free live chat for your website