Mac Apps for Screensavers & Wallpaper

Aerial

Free

Watch aerial views of various places as your screensaver.

RightFont

Trial version

Manage your fonts.

Process Monitor

Paid

Display the real-time system, process/thread, and registry activity.

You Control: Fonts

Trial version

Create a WYSIWYG font menu that displays fonts in their own typeface and groups them into families.

folderol

Paid

Move past colored dots to fully colored folders.

ShiftIt

Free

Quickly manipulate window position and size using keyboard shortcuts.

ImageSorter X

Paid

efficiently organizes folders containing images

WebSaver

Trial version

Screensaver that shows any web site.

DeskFun

Free

Personalize desktop beyond a simple background picture.

Screensaver +

Paid

Attractive yet practical screensaver app.

Scoreboard Widget

Free

Get the baseball box scores whenever you d like.

TrashMagic

Trial version

Protect contents of the Trash and restore emptied Trash.

3D Desktop Aquarium Screen Saver

Trial version

Realistic 3D fish swim around your desktop.

MenuStrip

Paid

Create your own fully customizable drop-down menus with your most commonly used applications, files, and folders.

GoogleNews Widget

Free

Get Google News right in your Mac OS X Dashboard.

LaunchBar

Trial version

Open apps, files, and URLs via abbreviation.

Split Screen

Paid

Allows you to effortlessly resize windows to exactly half your desktop.

Weather Underground Weather Widget

Free

weather widget

SideEffects

Free

Enable color icons, Mountain Lion or Lion Finder sidebar in the Mavericks.

iCandy

Paid

Brings your desktop background to life with live wallpapers that move and animate.

The Weather Channel Screensaver

Free

current weather conditions

Tree Size

Free

Counts folder and subfolder size

Mousepose

Trial version

Highlight mouse cursor that visualizes clicks, good for presentations.

Mowing Man and Boris

Trial version

Mowing Man and Boris Screen Saver