Umbraco Grid Editor
A popular advanced data type in many CMSs is a flexible grid/area, where other components can easily be placed. Some systems will have just have an advanced HTML editor where all content can go in - but more and more will want to keep content structured as much as possible.
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Umbraco Health Check
When you are managing a complex CMS instance, this is a really clever way to provide an super user / administrator a quick overview of which issues they potentially are facing, along with suggestions on how they can be fixed.
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