The 3.1.3 version of DockExtender for Mac was available as a free download on our website. This Mac application is a product of CodeTek Studios, Inc. The application lies within System Tools, more precisely System Optimization.
From the developer:
DockExtender gives you instant access to your applications and documents. With DockExtender you can organize all of your applications and documents into as many as 10 different menus, all one mouse click or key press away. You have complete control over DockExtender menus. You can organize the menus into separate submenus, put in labelled separators to break up groups of apps, or just load in the contents of a folder.
You may want to check out more Mac applications, such as Dock Delight, which might be related to DockExtender.