Cambuildr not only allows you to organize contacts into groups but also provides you with a list and detail view of all people.
List view
The search function in the center of the list finds results in the name as well as in the email address and in the notes you can make about a person.
In the list view, you can block and unsubscribe people.
Person detail view
By clicking on a contact you get to his detailed view. Here you will find all master data (name, email, address, ...), custom fields, tags (top right), the action timeline, and more information.
You can also edit contact information in this view by clicking on "Edit profile" or one of the pen icons.