Use Google Forms for exit tickets, formative and summative assessment, and to gain information from your students. Use it as a way to ask for feedback, to extend their thought process, and to receive feedback from each other.
Use Google Docs to allow students to express themselves, communicate feedback, and to write online.
Use Google Classroom to communicate with students. Use it as a social media tool to share thoughts and resources, to offer a kind word, and to offer feedback.
Think virtual post-its that can be shared with the world. Organize your classroom, create groupings, keep tabs on tasks, and share information with students through this all in one app.