Rabbi Moshe Dovid Robinson has created a great tool that we are certain that you and your students can find incredibly helpful.
Note: this Google Calendar setup can only be done on your desktop. Next, you click the settings wheel on your Google calendar and there’s an import-export icon on the left side.
Download the above link/file, upload it and click import. And boom…you and your students will easily have a great reminder to help count the Omer!