Although Craft CMS is not that famous, it is extensively being used by Netflix and Salesforce websites. It is developer friendly due to its extensive back end features for your application. It does not provide any front-end themes. Unlike WordPress, it does not have a predefined content type and hence it allows the user to set up their own content by making use of 18 different types of fields. It provides user view to the admin console and also enables side by side changes that they can make. The admin can create groups that can help in restricting or enabling different users from accessing some specific features. It supports different environments which can help in creating site locally. It deploys to staging and then to production. The flexible fields can also help in creating perfect interfaces with complete developer control.
I found CMS Made Simple to be very easy to template, for instance. And I used ModX for years before using WP, and it is also very easy to template, and offers a lot of nice features. They will appeal to someone who wants to develop, but is generally uncomfortable in PHP. You can mostly get by with HTML and template tags. This tends to prevent the “white screen of death”.
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