WYSIWYG editor for user-generated articles

Hi guys,

I’m trying to set up something like that: users go to the page and if they want to contribute they sign up (preferably with FB/Google but email is also good) and then are forwarded to medium-like editor where they can write an article with pictures etc and submit it for revision which I can do in backend.

Alternatively – users write an article without sign-up and it gets send to my email so classic contact form functionality but it would be important that it has WYSIWYG functionality, they can add pictures and see how the whole thing looks like before submitting (I guess it could be done with CSS and some more advanced contact forms but I can’t find a good one).

Thanks!