2DOrNot2D is a utility for Mac OS X 10.5 "Leopard" which makes it easy to switch between the 3D and 2D appearance of the Dock
(commercial) CandyBar is a system icon customization utility for Mac OS X. Apart from letting you easily change the icons of applications and hard drives, it also lets you change icons that you usually can't, such as your dock's trashcan.
(shareware) Classic Toggler is a small application that provides a convenient means to launch, quit, and manage the Classic environment.
Color Blender is a Cocoa application designed to make color selection easier.
(commercial) Color Labels is a program for colorizing your Mac OS X icons like the old Mac OS 9 color labels.
Color Schemes helps you put together up to 28 color schemes, each color scheme with up to three colors.
ControlTower is an application to allow users to manage terminals in Apple's Terminal application. It provides a window with a number of terminals that can be customised by the user and can be launched with just a couple of clicks. Each terminal uses a different colour set to be easily identified and can have automatically launched commands (for example to automatically ssh to a server).
Cubicles lets you switch between multiple desktops in Tiger.
Cursorcerer allows you to hide the cursor at any time by use of a global hotkey. It can also autohide an idle cursor and bring it back as soon as you move the mouse.
a preference pane which allows you to manage items which have been added to Mac OS X in the Library folders
Dock Delight removes the blue lights used by Leopard's Dock to indicate which applications are running, and replaces it with a small black triangle, similar to the one found in previous iterations of Mac OS X.
Dock Library is an application that takes the headache out of managing styles for your Leopard dock.
Isolator is a small menu bar application that helps you concentrate. When you're working on a document, and don't want to be distracted, turn on Isolator. It will cover up your desktop and all the icons on it, as well as the windows of all your other applications, so you can concentrate on the task in hand.
With LinCastor you can create your own URL scheme and associate it with an AppleScript, shell script or an application.
LocationChanger automatically changes numerous settings in OS X based on location. Can reconfigure Mail, iChat, Volume, Printer, Privoxy, NFS, SMB, Skype and all proxy settings based on detected network environment.
Loginox is an application which lets you easily customize the login screen.
OpaqueMenuBar is a tool for Mac OS X 10.5 "Leopard" to make the menu bar non-transparent, so you cannot see through it any more.
PresentYourApps lets you easily remove or hide the Dock and menu bar when launching selected applications. It does that by changing just one tiny line in any application?s package, taking advantage of a functionality built-into Mac OS X.
Quick Change offers a customizable list of user-defined types & creators and file extensions which allow for quick file association.
RCDefaultApp is a preference pane that allows a user to set the default application used for various URL schemes, file extensions, file types, MIME types, and Uniform Type Identifiers (or UTIs; MacOS 10.4 only).
Service Scrubber lets you restructure the services menu, change service keyboard shortcuts, and disable services.
Shades is a utility for controlling the brightness of your screen. It runs in the background providing easy control over the brightness of your display via a slick Mac-like interface, with greater dynamic range and finer granularity than the built-in controls.
Spaces.. Spaces.. Spaces..
Spaces.. Spaces.. Spaces.. works by injecting a small piece of code into the Dock. The code will prevent the Dock from switching to a different space immediately after switching to a different application (using Command-Tab, for instance).
SwitchUp lets you manage profiles for Mail, Address Book, iTunes, others.
Change your dock from the new 3D-look to the old(more like Tiger) 2D-look or reverse.
ToggleDock toggles Leopard dock between 3D mirror & 2D smoked glass.
TransparentDock is an application that allows customization of the Mac OS X dock. The transparency level of the dock is fully adjustable, from fully transparent to fully opaque, or somewhere in between.
Utility Lock is a custom built Screen Locking mechanism, it was designed after the Apple lock that is available in Apple Remote Desktop, its purpose is to allow for a greater customization in how the screen is locked, you can now have it locked on Sleep/Idle/Intervals and with the applescript support you can combine it with other applications like WiFiScriptor.
Xspinner is a utility for Mac OS X 10.5 Leopard, that allows users to access hidden features and preferences in the system and applications, and provides easy launch of system maintenance scripts.