Log in as a different user from the SharePoint UI. The ability to log in to a SharePoint site as a different user was taken away in SharePoint 2013 but we put it right back there again.
Alt Login is a farm solution that works with SharePoint 2013 and 2016 and it’s completely free. The package actually consist of 3 solutions scoped at the Farm, Web Application and Site Collection. You don’t need to install all 3 solutions, instead just choose the variant with the scope that best suits your needs.
Visit the downloads page to grab your copy of Alt Login today.