Craft CMS. It allows you to define a meta model in a convenient editor, and lets you render out data with a template engine (HTML/JSON/...). The meta-meta-model consists of a few sensible objects, so it's not just UML rendered down. It has fine grained access control, so you can define which user can access what data.
Things like image uploads in the backend (admin) area are solved. E.g you can setup an S3 bucket that is used for your site's dynamic assets.
Security updates are one-click-installs and I'd say there is at least one per week.
There are plenty of plugins available, too.
It's a bit pricey (compared to FOSS) if you use it for clients, but you can develop for free or even host your own website for free with it.
I've used it twice so far, and I enjoyed it very much.
Things like image uploads in the backend (admin) area are solved. E.g you can setup an S3 bucket that is used for your site's dynamic assets.
Security updates are one-click-installs and I'd say there is at least one per week.
There are plenty of plugins available, too.
It's a bit pricey (compared to FOSS) if you use it for clients, but you can develop for free or even host your own website for free with it.
I've used it twice so far, and I enjoyed it very much.