I recently released the first version of Wheelhouse CMS - https://www.wheelhousecms.com, which is a Rails-based CMS including WYSIWYG editing, template-based form generation, media library, plugins and a decent UI.

It's not free software but from my biased perspective its by far the best CMS I've ever used and my clients love it.

Demo here: http://demo.wheelhousecms.com