Download of Tonaltopia 1.02 for Mac was on 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 software for Mac is Appnotix. We recommend checking the downloaded files with any free antivirus. The program lies within Design & Photo Tools, more precisely Viewers & Editors.
From the developer:
Tonaltopia creates a black and white, toned or sepia photo to evoke a sense of nostalgia in your image. Sometimes the goal is to make the new photo look like an old photograph, evoking a sentimental feeling from you, as if you're recalling a faded memory from long ago or create a monochromatic photo opting using some color rather than the entire spectrum to give your photo a more powerful result.
You may want to check out more Mac applications, such as Cuadro or Resize Now, which might be related to Tonaltopia.