VirtueDesktops
virtuedesktops.info/index.php/about
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
“VirtueDesktops” is a virtual desktop manager for Apple’s Mac OS. It offers features, eye candy and configurable options that no other desktop manager on the mac has added yet, and is under active development. It is based upon the work done by Rich