I realise this might be off topic - but is there a google-docs style latex editor "out there" (so cloud based file management). Which is free, yet has higher limits? Sharelatex I can't use enough collaborators (10 max, need at least 20), while with writelatex the file limit is quickly reached (60 max, we're creating a document about 500 pages with likely 300ish images) - and it doesn't support xelatex which we'd like to use.
So is there a free solution out there I am missing?