Downloading Tonality 1.4.2 for Mac from our website was free. The program lies within Design & Photo Tools, more precisely Viewers & Editors. The actual developer of this software for Mac is Macphun.
From the developer:
Tonality gives you the power to create stunning and dramatic black & white images. This is a complete monochrome image editor with more than 150 one-click style presets, totally unique creativity tools, stackable layers, adjustable brushes, RAW file support and so much more will blow you away. Tonality Pro is also available with additional features; find out more here.
You may want to check out more Mac applications, such as MuSA_RT, SeparationStudio or Chops, which might be similar to Tonality.