DS Clock: A customizable digital desktop clock that can synchronize a computer's clock with atomic time servers. [Win32]
Loop Movie: QuickTime movies that play continuously on the desktop.
Samurize: A system monitoring and desktop enhancement engine. [Win 2K+]
SeeDesk: A utility which makes the icon text background on Windows 95/98/Me desktop transparent.
SoftProfile: Juggler is a window manager to set any window to be always on top of other windows. Compatible with Windows 95/98 and NT 4/Windows 2000.
Tidy Start Menu: Organizes the Start menu by category. [Win 98+]
Transparent Window Manager: A tool to manage windows settings including transparency.