Downloading SwitchTop 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 program is categorized as System Tools. We recommend checking the downloaded files with any free antivirus. The actual developer of this software for Mac is By Limit Point Software.
From the developer:
SwitchTop is an application that allows you to have multiple desktops. Is your desktop cluttered with many files and documents? Do you wish you had more desktop space? SwitchTop is your answer. Easily create and manage your desktops and switch between them quickly. SwitchTop is simple to use, all of its features are accessible through it's application dock menu.
You may want to check out more Mac applications, such as pdf-FieldMerge, which might be related to SwitchTop.