RecentDock 4.1.1 for Mac was free to download from our software library. This software for Mac OS X is a product of atalantia. The application lies within System Tools, more precisely System Optimization.
From the developer:
RecentDock adds recently used applications to the Dock and lets choose the amount of application shown in the list. The app uses the Adobe scripts to run and perform the required operations. The administrator permission is used prior to launching the application.
You may want to check out more Mac applications, such as Dock Delight, Snow Checker or SBSystemPrefs, which might be similar to RecentDock.