Demodit GmbH (http://www.demodit.ch) has released GroupsPro 1.0, a contacts and groups organizer for OS X (10.9 and later). 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 provides users with the ability to create and modify groups of address book contacts. When Groups is selected, a window appears detailing the name of each group and how many contacts are assigned to that specific group. By clicking on a group, its contacts are shown or hidden in the contact list.

GroupsPro allows users create and modify mailing lists to send mass e-mails. Its mailing lists can be set up to contain members of groups or individual recipients. GroupsPro gives users the ability to determine which groups or e-mail addresses (i.e. home, work, etc.) to use automatically. Specific individuals can be included in the mass E-mail through clicking a simple on/off button. Users can also determine for every contact single or multiple E-mail addresses manually.

GroupsPro supports English, Arabic, Dutch, French, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese, and Turkish languages.

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