Thanks for your help, but sphere seems to be for managing opened programs. I'm really looking for something to just group several icons together, so that I don't have 15+ icons on my taskbar.
This is what I mean:
You can see in the image above that the user has grouped various network utilities into one folder, which he has put on his taskbar (dock on mac). None of them are opened programs, they are just icons. When a program is launched, its icon appears separately on a dock, indicating that that program is running.