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.
Skype is a multi-channel communications software that provides video chat, voice calls, instant messaging & more to business of all sizes, across the world.
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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.