One of the earliest edtech tools that I recommended to the teachers involved in the Writing Ourselves project, which I am the Technology Director for, was the DraftBack Extension. Once enabled, the extension allows you to playback your writing process for any doc that you are an editor on. Obviously, the best use case for this would be to have students do this.
What a powerful way for students to reflect on their writing process and for educators to assess (and offer feedback on) the way that they go about the writing craft. Awesome sauce.