Download of treeviewX 0.5 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. TreeviewX for Mac lies within System Tools, more precisely File Managers.
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. The actual developer of this free Mac application is Roderic D. M. The following version: 0.5 is the most frequently downloaded one by the program users.
From the developer:
TreeView X is an open source program to display phylogenetic trees.It can read and display NEXUS and Newick format tree files (such as those output by PAUP, ClustalX, TREE-PUZZLE, and other programs). It has a subset of the functionality of the version of TreeView available for the Mac Classic.
You may want to check out more Mac applications, such as TreeView X, which might be similar to treeviewX.