Google Drive Free but only available with a Google account.
Kaizena (Web, iOS, Google Drive Add-On) Multiple forms of feedback to students’ work: written comments, voice comments, an embedded video lesson, and a score on a specific rubric standard.
Microsoft Word Online (web, Microsoft Word download) Create docs online, edit and share while you work with others at the same time. Software version track changes function allows the comments to appear in the right-hand column. When the reader clicks on the reviewer’s comments, the related text is highlighted in the document on the left. Many people can add comments and changes to the same document and Word will label and colour-code them for each contributor, making this a valuable tool for collaborative work.
Peergrade (web) A platform where students can evaluate each other’s work anonymously. You create an assignment, specify your feedback criteria and open the assignment for submission. Your students submit their work which can be anything from Word documents to Youtube videos. Peergrade automatically assigns work between the students, ensuring that everyone will get feedback. The students give feedback to the work assigned to them using the feedback criteria. When the peer feedback process is over, the students receive all the feedback given to their work. As a teacher, you get the complete overview of the quality of assignments and what feedback was given.