Google Hangouts app for your phone, if you don't have it, check it out today. It's a great way to stay connected with your peers and community who are using it already. With the app, you are not tethered to your computer for communications.
The latest update to the app now allows users to reply directly from your notifications menu which is a GREAT time saver for quick replies.
Google Classroom is great tool for digital classroom management. Gone are the days of creating elaborate and sophisticated folder systems for students to share documents, projects, etc with you.
And the mobile app just keeps getting better. Encourage your students (whom have cell phones) to download the app for quick access to the information you are sharing with them regularly.