Demodit GmbH (http://www.demodit.ch) has released GroupsPro 1.0, a contacts and groups organizer for OS X. It allows users to manage their contacts, contact groups, and create mailing lists for mass e-mails.

When GroupsPro is initially launched, it auto-populates the user’s existing contacts into the interface. Users can add or modify existing contacts. There are two options to assign contacts into specific groups. With Single Assigning, users assign a single contact to groups. With Fast Assigning, users assign contacts directly in the contacts list to a group.

What’s more, all currently existing contacts in the list can be assigned by clicking on mass update button. Users can also search for names, phone numbers, e-mail addresses, postal addresses, departments, and notes within all contacts.

GroupsPro 1.0 costs US$2.99. It’s available worldwide exclusively through the Mac App Store in the Business category.