The clySmic Icon Bar (Clysbar) is a series of nested (tree-structured) vertical or horizontal bars with iconic buttons used for running programs under Windows 3.1. I've seen other icon bars, and though the idea was good, the implementations left a lot to be desired. So I wrote Clysbar to do everything I'd want an icon bar to do. Clysbar is a Program Manager replacement, but not a File Manager replacement. Clysbar is a Shareware product.
Note: Clysbar requires Windows 3.1, as it takes advantage of many new 3.1 features, including drag 'n' drop and icons for DOS programs.