The 1.0 version of Close all Open App for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within System Tools, more precisely Automation.
This free Mac application is a product of Double H Software. 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. The following version: 1.0 is the most frequently downloaded one by the program users.
From the developer:
A handy application that closes each individual application that runs on your Mac. It asks to save changes, and allows warnings, so, do not be worried, you will loose nothing! A good idea and a great thing is to run this application before shut down, to make sure everything is closed and no messages will pop-up. While this application is for Mac OS X 10.5 or later, it should work seamlessly in Tiger or earlier.
You may want to check out more Mac applications, such as App for Vine, Open Color Companion or App for Vine - Pro - Menu Tab, which might be similar to Close all Open App.