Recommendation for a contacts app

I'm searching for an app to administer my contacts but another then the nativ Contacts app on my Mac.
I tried Busy Contacts as an alternative but it hasn't convinced me fully.
I need an app which let me arrange the fields on my own. And it shouldn't offer to much possibilities. That usually makes an app too full and complicated.
So, does anyone know an accessible easy to use contacts app for the Mac?
Thanks and all the best
Jürgen