There are seven Gmail integration apps in the default Ubuntu 16.04 repositories.
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Gmail (unity-webapps-gmail) discontinued in 18.04
Gmail Webapp for Unity
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Gmail Notify (gmail-notify)
Notify the arrival of new mail on Gmail
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Gnome Gmail (gnome-gmail)
GNOME Gmail integrates the Gmail web interface into the GNOME environment. Once installed, Gmail becomes a choice as the default Mail Reader in the GNOME Preferred Applications administration application. When selected, a Gmail webpage will be used whenever an email service is requested.
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CheckGMail (checkgmail)
CheckGmail is a system tray application that checks a Gmail account for new mail. When new mail is present the tray icon changes, an optional animated popup is displayed and a tooltip displays the number and details of new messages. Configuration is GUI-based and the application is designed to be simple, elegant and unobtrusive.
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Webmail for Linux Desktops (desktop-webmail)
Provides a generic mailto: handler and webmail config dialog that lets the user choose his preferred webmail provider on first run and through the desktops Preferences-> Webmail facility.
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Unity Mail (unity-mail)
Unity Mail is an application that integrates your mail into the Unity, MATE, Xfce, LXDE and other environments. It displays notifications about incoming mail, shows the number of unread messages and displays subjects in the Messaging Menu. The Launcher item also has a quicklist that provides quick access to your mail folders (configured for Gmail by default). It also allows you to quickly compose a new message.
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KGmailNotifier (kgmailnotifier) discontinued in 18.04
Gmail notifier applet for the KDE Plasma Workspace. When a new mail has arrived in your inbox a small window will pop up, showing author and subject of the newest mail. The underlined link will take you right to your inbox (using your preferred browser).