LumaTone 1.1.1 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is PoseMotion. The application lies within Design & Photo Tools, more precisely Viewers & Editors.
From the developer:
LumaTone is a small free utility that lets you apply a color scheme to images based on the luma value of each pixel. The application has a simple design and it is easy to use. You you just need to choose or create a color scheme and drag your image onto the window.
You may want to check out more software for Mac, such as QuickShow OSX, Stone Studio or PhotoDesireeExpress, which might be related to LumaTone.