Save Hollywood - Play movies as your screen saver
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Padbury Clock Screensaver - Minimal screensaver for Mac
ScreenPlay - Open-source and cross-platform Wallpaper, Widgets and AppDrawer app.
HotShots - Hotshots is a screenshot tool with some editing features.
Lively Wallpaper - What is it? Lively is a Free and Open-Source Software (FOSS) for animated desktop wallpapers.