Facebook users can check the list of authorized app in their account using the Account Settings. Login to Facebook, click the Account drop down and select Account Settings from the menu list.
In the Account settings page, click the Application menu available on the sidebar.
This would display the list of Authorized apps which could interact with your Facebook account. Now click on the Edit link available next to the app that you want remove.
Then click the Remove app available in the Edit section.
The following prompt will be displayed asking you to confirm whether the app needs to be removed.
Once the app is removed, Application Removed confirmation message will be displayed as shown below.