DoctorContact 4.0.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The program is included in Communication Tools. This Mac application was originally created by Swamp Dog, LLC.
From the developer:
DoctorContact is designed to help you manage, clean, and repair the records managed by Contacts. While the Contacts application is normally used to store contacts in iCloud, the Container feature allows the Contacts application to manage other repositories. Doctor Contacts works with all of these supported repositories. Therefore, DoctorContact can address whatever you have set up in System Preferences.
You may want to check out more Mac applications, such as Address Book to HTML, MailBrowser or YAI, which might be similar to DoctorContact.