Downloading GWintree 0.9.9 for Mac from our website was free. This free Mac app was originally designed by David J. Cooke. The application lies within Lifestyle Tools, more precisely Bookkeeping & Cataloging.
From the developer:
GWintree is an application that provides GEDCOM-based facilities to record, view, edit, and merge genealogy data. In addition, it lets you produce reports, family trees showing all relatives, and other charts. The program is a port to Linux of Wintree v5.1, offering similar functionality.
You may want to check out more software for Mac, such as GHC Interactive System with Extensions, Book Magic or Bento works, which might be related to GWintree.