Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Snaptivity - Real-time photo sharing with the world nearby
Lively Wallpaper - What is it? Lively is a Free and Open-Source Software (FOSS) for animated desktop wallpapers.
Flashgap - Time-delayed photo-sharing app of last night's embarrassment
ScreenPlay - Open-source and cross-platform Wallpaper, Widgets and AppDrawer app.
Slingshot - Quickly share everyday moments with lots of people at once