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Create a Canvas Discussion that allows your students to respond to a prompt and/or to one another. You can have students post their work to receive feedback from peers. Discussions may be graded or ungraded.
Use Padlet as a digital bulletin board: students can add short text responses and images, and they can comment on each other's posts. This is a great way to get responses to a particular question, and a fun way virtually check in with students and see how they're doing.
Google Docs' Suggestion mode, like Microsoft's Track Changes, allows viewers to make suggestions and edits, as well as add comments, to a piece of writing: you can encourage your students to use it to virtually edit each other's work.