Remind is a great way to communicate with students and parents.
This app is the best electronic tool I've ever used! I don't use it to teach, but it is a great tool for communicating.
How I Use It
I send frequent messages to my students such as daily assignments (page # and problems assigned), reminders of upcoming tests, pictures of textbook page (since only about 3/4 of my students have an electronic device). I can message individual students, an entire class of students, or multiple classes at one time. I set up each of my classes, and students sign up for their class using a code I give them. Parents can sign up as well so they can stay informed. Even parents of high school students appreciate knowing their child's assignments, upcoming tests, etc.