What are some alternatives?
Mura - Mura CMS is an open source CMS that is both powerful and easy to use.
WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.
Contentful - You don't need another CMS. You need a better way to manage content — unified, structured, and ready to deploy to any digital channel.
Craft CMS - Content management system built on Yii PHP Framework
Agility - Asset & maintenance performance management software
HubSpot Website Platform - HubSpot Website Platform is a content management system that enables marketers to build websites personalized for every visitor.