Authorea is an online LaTeX editor specifically aimed for academic work, particularly journal articles submission.
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Pro Submit articles directly to journals
Authorea has a Direct Submission feature, that allows authors to directly submit their work to several academic journals, with the correct formatting.
Pro Real-time collaboration
Ability to edit in real-time like Google Docs.
Pro Get a DOI to make your work citeable
You can post a preprint or make your draft public on Authorea, and request a DOI. Having a DOI means your work is citable on e.g. Google Scholar. Because it mints DOIs, Authorea is a good venue for privately writing and publicly posting preprints, research plans, and finished papers.
Con Not completely free
Authorea can be used with a free plan, but to get the complete set of features, a paid subscription plan is needed.