I noticed I've got one site which has the following features in the admin:
While none of my other sites (self-hosted) have these features.
I have no plugins which have these things, at least none that I know of. All sites use WordPress 3.8.3 and Jetpack.
On the self-hosted sites I don't have the following option (like on wordpress.com) on ANY of my sites (also NOT on the site that DOES have the above mentioned features):
Settings → Writing → Your Custom Content Types
So.... Naturally (or not?) my question is:
How do I get these features on my other self-hosted sites as well?
The only difference I noticed is the language pack, but I can't imagine that would make a difference. The site that has the above mentioned features has the Dutch language pack installed and activated. All the other sites don't have this language pack installed and activated.