Overleaf is an online LaTeX and Rich Text collaborative writing and publishing tool that makes the whole process of writing, editing and publishing scientific documents much quicker and easier.
MIT's Overleaf Pro+ account gets you:
If you registered with your mit.edu email address, you will automatically be moved to a Pro account.
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If you used another email address, you will be invited to validate your MIT affiliation when you sign in from the MIT IP address range or you can sign in to link your accounts.