iExpression 1.0 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 program is categorized as System Tools. This software for Mac OS X is an intellectual property of RED When Excited Ltd. We recommend checking the downloaded files with any free antivirus.
From the developer:
iExpression is a dedicated application integrated with the popular ExpressionEngine CMS (Content Management System). It allows you to upload and manage files, edit and create entries (regardless of whether or not they were created in iExpression, or using ExpressionEngines web interface).
You may want to check out more software for Mac, such as eps2pdf, Files Renamer or png2swf, which might be similar to iExpression.