Your comments

The reason I do not want the links to be a part of the note-text is that there sometimes is not a clear and simple way to describe the link. 

And I do not want to add text to my note just to create a link to another note because that link-text add's no true value to the text in the note and distracts when reading it. The text of the note and the link are independant of each other. 

Especially when you have multiple links (2 websites, a folder on your computer and about 5 internal links (persons for example) to other notes) you have to add all that textually into your note. That removes the focus on what the note was all about. 

Take a look at the old Evernote 2.2 for how tags are used. In Evernote it are not really tags but look at the way it is managed. There are only tags but the can have childs by manually D&D them on another tag or by creating a new tag using the right-click menu on the current tag.

I would like to see a way to link notes without integrating the links inside the note.

See http://cintanotes.com/forum/viewtopic.php?f=3&t=1329 for an explanation.