Developers, designers, audio pros, or anyone who uses a large number of folders will welcome the ability to jump directly to a frequently used folder or file from within any application. ReFind lets you do so without searching or clicking through stacks of open Finder windows.
Cookie Stumbler finds browser cookies, including advertising and tracking ones, and gives you the option to delete them all, or inspect and banish them individually.
Anyone who spends time in the Finder's Get Info window will find FileXaminer's attribute- and permissions-editing features a must-have.
NetUse Traffic Monitor keeps an eye on your Internet activity, displays it on a graph, and provides alerts to keep you out of the bandwidth poorhouse.