Really easy to use text editor aimed for researchers to upload papers directly to some journals. You can write comments/discuss on a particular paragraph.
Free accounts for only one private document. Though your university may have already subscribed for an organisation plan.
Pros
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LaTeX and markdown editor.
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history of modifications saved.
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shareable link to read.
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independent paragraphs for editing and commenting.
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chat for authors (help to show a discussion to new added authors).
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github integration.
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can assign DOI number to your documents.
Cons
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needs account to collaborate.
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No ORCiD integration.
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Not allow you to move blocks of markdown/latex/tables
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Unable to see where the people is editing
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Documents section contains a lot of files - difficult to know which one is which.
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You cannot edit a markdown/latex block if someone is editing it (and it doesn’t tell you).