We’ve officially cleared mid-August, which means it’s time to start thinking about homework, after-school activities and weekend school commitments. Studious is a strong candidate to keep your academic life flowing smoothly. The app not only makes it easy to add appointments, but users can also add homework assignments, test schedules and notes to each appointment. Plus, Studious has one particularly nifty feature — the ability to set the ringer to silent, vibrate or airplane mode automatically once class starts. Now that’s service. Free, for Android devices.