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.
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.
LinkedIn Premium provides advanced features through premium subscriptions, like Premium Career for jobs, Sales Navigator for leads and clientele, Recruiter Lite for hiring, Premium Business for insights and business expansion, LinkedIn Learning for skill improvements, etc.