Amazon Web Services (AWS) is a comprehensive, evolving cloud computing platform provided by Amazon that includes a mixture of infrastructure as a service (IaaS), platform as a service (PaaS) and packaged software as a service (SaaS) offerings.
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.
The Windows Azure Platform enables businesses to run critical applications with a higher performance-price ratio by running them on the services platforms data centers on a pay-as-you-go basis.