Authorea is an online LaTeX editor specifically aimed for academic work, particularly journal articles submission.
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Pros
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.
Cons
Con Not flexible
e.g. you cant edit title page as you need
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.