Try Authorea! (Disclosure: I work there) Authorea is for researchers to write and collaborate online. Multiple users can write across formats in the same docum

Try Authorea! (Disclosure: I work there) Authorea is for researchers to write and collaborate online. Multiple users can write across formats in the same document (including LaTeX, markdown, rich text) and you can push a button to export to different file formats, journal styles, or publish to the web.