Download of SpoofCard 4.8 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. SpoofCard for Mac lies within Security Tools, more precisely Personal Security. This free Mac app is a product of SpoofCardWidget.com. We recommend checking the downloaded files with any free antivirus.
From the developer:
The SpoofCard Widget from SpoofCardWidget.com allows you to change what people see as your Caller ID number when they receive your call. SpoofCard works with any number in the United States and Canada.
To use the widget, enter your 10 digit phone number in the "Your Number" field.
You may want to check out more software for Mac, such as Key Holder or PasswordVault Lite, which might be similar to SpoofCard.