Kontakter is a simple yet powerful address book designed with beautiful interface and powerful features such as ultra quick search function. It offers you a very powerful search bar where you can type any string of text that your contact can be found upon. It can be almost anything that any of your contact information fields can contain. The server of the software provides a central database based on SQLite where all your contacts are stored and it is even possible to synchronize them over the network. You can password protect your database to keep your private information secure. Other features include vCard support, export to PDF, custom fields, etc.