Wallmaster allows a user to set different wallpapers for each monitor in a multi-monitor setup.
It is written in .Net 3.5

It provides the following features:
- Completely independent selection of wallpapers for each screen
- Random selection of wallpapers based on a user defined directory
- User defined interval for changing wallpapers
- Selection of a different background color for different monitors
- Multiple options for placing a wallpaper on a screen
- Center
- Centers image, cropping it to the limitations of the screen
- Stretch
- Stretch the image to take up the entire screen, distorting aspect ratio
- StretchRatio
- Stretch the image to take up the entire screen, maintaining aspect ratio
- This may result in either horizontal or vertical bars around the image
- Magic
- Center an image when it is smaller than the screen, otherwise use StretchRatio
- Dynamically discovers screen the number of screens
- Resize images automatically when the screen resolution changes
- Hides in notification tray on minimize