TYPO3 Website Development: Fluid ViewHelpers
It’s quite ridiculous but: you cannot access the categories of a content element in its template. Thus I wrote a ViewHelper for it.
Within the T3 core I have not found a way to access GET parameters which I needed to hide elements on the condition that a plugin shows a detail view. I wrote a ViewHelper returning an array of GET (or POST) parameters which you can use in Fluid conditions as well.