Download of treebolic 3.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free Mac application is Bernard Bou. The software belongs to Education Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Treebolic is a Java component (widget) whose purpose is to provide a hyperbolic rendering of hierarchical data. A tree is rendered with nodes and edges but display space is subject to a particular curvature (hence the name) : more space is allocated to the focus node while the parent and children, still in the immediate visual context, appear slightly smaller.
You may want to check out more software for Mac, such as Genealogy Pro, sciatrope or Curvus Pro X, which might be similar to treebolic.