Synchronicity is an editor for Gmail address book that enables you to handle contacts from Windows/MacOSX/Android. 1. Update/Add/Delete gmail groups/contacts/pictures.
2. Backup/Restore your important address book with pictures.
3. Import address book from other accounts.
4. Available for Google Apps.(i.e., firstname.lastname@example.org)
5. A license is available for Windows/MacOSX/Android.
6. Trial version is free. Give it a try!