Gmail is a free, advertising-supported email service offered as part of Google's G Suite, with 15GB of storage, color-coded inbox filters and unsend button.
Quip is a collaboration solution which allows teams to create and work on documents, spreadsheets, and task lists in real time with built-in chat and commenting.
Salesforce.com, Inc. is an American cloud computing company headquartered in San Francisco, California. Though its revenue comes from a customer relationship management (CRM) product, Salesforce also sells commercial applications of social networking through acquisition and internal development.
Zendesk is a cloud-based customer service software solution trusted by over 40,000 organizations worldwide. Companies such as Groupon, Box, and Zappos are using Zendesk to lower costs, raise productivity, and increase customer satisfaction. Loved by both customer service teams and their customers for its beautifully simple interface.