You could have downloaded TheGoodBook X 4.3 for Mac from our software library for free. The program lies within Business Tools, more precisely Project Management.
From the developer:
TheGoodBook keeps track of names and addresses as well as phone numbers and e-mail/web information. It is very quick to use. All relevant information is on one screen, and data can be entered without using the mouse. It even capitalises your entries saving you yet more time. TGB searches for any information in either single or multiple fields. You can enter part words or even single letters.
You may want to check out more software for Mac, such as Express Project Management Software or Courier Software for Mac, which might be similar to TheGoodBook X.