Download the Flipgrid app on your phone (iOS and Android)
Flipgrid allows students to upload video feedback. Create a "grid" for your classes. Inside each "grid" you can post multiple topics. Inside each topic, students can add their videos. Post a topic online for students to see each other's responses. Any short, formative response that you ask students to do can be turned into a Flipgrid.
Response to a reading
Explain a concept (students can decide who explained it best)
Student self analysis:
Have students use paperrater to address an essay draft. Students can respond in flipgrid what they learned about their own writing, and state a goal they have for the draft based on what they learned.
Padlet allows you to create a blank "wall" on which anyone with the link can add text, pictures, links, or video. This gives your classroom a blank space for collaboration, class discussion, posting assignment material, etc.