Review for CardBook by Erik O.
Rated 5 out of 5 stars
While not yet perfect, I give this 5 stars as it is awesome. It installs fast, integrates into TB quite nicely and supports custom fields from contact lists in ownCloud.
Its definitely worth using and IMO the best cardDAV client out there for TB.
To create your own collections, you must have a Mozilla Add-ons account.