Updated: Nov 9, 2018
The new interface for Google's Account Permissions Page enhances visibility and control of permissions granted to devices and services.
Google's Account Permissions page has a new improved interface which enhances transparency and control of permissions granted to devices, Chrome extensions and third-party services to access your Google Apps Account.
To access your Account Permissions Page navigate to your Account page:
Select Sign in & Security
Then select Apps with account access
The Account Permissions page displays a list of authorised devices, third-party services and applications which have been granted permission to access your Google Apps account.
Get quick access to your permissions page using the following link: https://security.google.com/settings/security/permissions
Common examples of permissions you may have granted include: an Android Tablet configured with your Google Apps account that will have Full account access; a Chrome Extension that may have permission to View and manage Google Drive files; and a third-party service that may have access to Basic account info.
For services you no longer use you should remove access to your account by selecting Revoke access. If you use the service again it will request access permission which can be reinstated.