Is there a LaTex Editor for embed in website?

For a project I need to give information in latex format from website's authors . and I want a light wight Latex Editor that embed on my website and help them to write and edit their documents.

I want this editor be like LYX( WYSIWYG(M) and tiny ) if it is possible if it isn't , I want it be easy to use for authors how much it could possible.

Is there any kind of that editor ? (and of course open source )