Downloading App Stop 2.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The common filename for the application's installer is appstop.zip. The most popular version among the application users is 2.1.
The actual developer of this software for Mac is Prosit Software. We recommend checking the downloaded files with any free antivirus. The bundle id for this application is com.mabwebdesign.appstop. The application lies within System Tools, more precisely System Optimization.
From the developer:
App Stop is a program that allows you to take control over the applications running on your computer, increasing the speed of your computer. It is designed to peform many operations on your applications such as pausing, setting processor priority, and force quitting.
You may want to check out more Mac applications, such as App for Vine - Pro - Menu Tab, Nox App Player or Scout-App, which might be related to App Stop.
System Optimization
Antivirus