Download of StampInStone 3.5.3 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. Commonly, this application's installer has the following filename: StampInStone-2008-03-13.dmg.
The bundle id for this app is com.stone.StampInStone. We recommend checking the downloaded files with any free antivirus. The most popular version among the application users is 3.5. StampInStone for Mac relates to Design & Photo Tools. This Mac application was originally developed by Stone Design Corp.
From the developer:
StampInStone™ from Stone Design makes it easy to add a stamp to any PDF document. The stamp can be a line of text or an image and can appear under or over the page contents. It can be placed anywhere on the page.
You may want to check out more software for Mac, such as TurboCAD Mac Designer, DropImageURL or Polaris, which might be related to StampInStone.