ImageHorn 1.0.3 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. The application is included in Design & Photo Tools.
The actual developer of this free software for Mac is Rorohiko Workflow Resources. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
ImageHorn is a plug-in designed to enable dynamic image fitting (‘horn’ like in ‘shoehorn’). Dynamic image fitting automatically re-applies the selected fitting settings to an image each time you resize the frame that contains it. Before you can use the ImageHorn plug-in you also have to install APID ToolAssistant plug-in.
You may want to check out more software for Mac, such as Cuadro or Resize Now, which might be similar to ImageHorn.