The CourseOff browser extension is an extension for Chrome. It can be used to find out if your friends will take the same class as you. You can also find out if they are already taking the class.

You can create an alternative schedule by clicking on the "Add" button. You will need to select the course, time, and class to add. You can add your friends by hovering on the course and then clicking on the "Add" button.

It's a unique application that will help you do well in class because you can group with your friends within the same class or ask tips from those who already took it beforehand.