SeeSaw is a great digital portfolio tool that works on Chromebooks, iPads, Android tablets, and any computer with a modern web browser. Earlier this year at the ISTE conference SeeSaw announced some new features including a new messaging option. The new messaging option is now available to all teachers. In the video embedded below I provide a demonstration of how to use the new SeeSaw messaging option.
It is important to note that while students and parents can receive announcements via SMS and push notifications only parents can reply to a teacher's announcement.
Disclosure: SeeSaw is currently an advertiser on FreeTech4Teachers.com