Since 2001, the Plone CMS has been downloaded millions of times and helped build many thousands of websites. Written in Zope (Python), Plone is extremely flexible and adaptable for all kinds of projects, from websites to blogs to intranets. Plone features a rich text and HTML editor, mobile-ready templates, SEO-friendly URLs, workflow, and more. There are a couple thousand different plugins for Plone and a large global community.
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Plone offers tons of out of the box features that I usually need to download as separate modules with other CMS tools. It's easy to get a lot done on it, without any development, but it's also a great platform to quickly build add-on modules on top of, which integrate with other SaaS platforms/services, or whatever I need to do.
The Bitnami installer is a great way to quickly install Plone on an Ubuntu server, for example, which I think is the way to go.