Alfred works with OS X Leopard and later. The basic version is free; also available is the Powerpack, which adds features such as iTunes remote control, file system navigation and management, a clipboard history that allows you to review and reuse previous copied and pasted items, and a recent documents viewer. It costs £12 (about $18.50).
Berokyo, which works with OS X Tiger and later versions, is a combination application/file launcher and desktop organizer.
The $18.95 program creates bookshelf-like organizers called cabinets for frequently accessed apps, folders and collections of files (documents, photos, videos, Web pages, etc.), presenting instant access and previews to all manner of content. Berokyo also offers a tagging feature that makes it easy to locate specific pieces of information or references across file types.
Dock Menus lets you create multiple free-floating docks separate from the built-in Mac OS X Dock; the floating docks can be moved around your desktop as needed. By creating multiple docks, you can group related apps, files and folders. Dock Menus works with OS X Leopard or later and costs $5 after a free 10-day trial.
From the same developer as Dock Menus, iDock works with the built-in Mac OS X Dock, letting you create multiple Docks, each with its own content, and switch among them as needed. This creates an effect somewhat similar to the multiple home screens in iOS and the Launchpad preview. IDock works with OS X Leopard or later and costs $5 after a free 10-day trial.
Like iDock, Dock Spaces lets you create and switch among varying Docks using the traditional Mac OS X Dock interface. Dock Spaces goes a step further than iDock in that it offers integration with the OS X Spaces feature, allowing you to tailor virtual desktops that automatically open specific applications, specific windows and a specific Dock for a variety of tasks such as graphic design, document editing, social media, Web browsing or chat. Dock Spaces is free and works with OS X Leopard or later.
DragThing is a venerable Mac tool that predates Mac OS X. It allows you to create Dock-like work areas that can contain shortcuts to applications, folders, files and URLs. There's also a space to store copied items for later pasting, offering a way to copy many items and have them readily available.
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