Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Anchor CMS - Free and lightweight blogging system
Lively Wallpaper - What is it? Lively is a Free and Open-Source Software (FOSS) for animated desktop wallpapers.
Textpattern - Textpattern is an elegant content management system that is free, open source software.
ScreenPlay - Open-source and cross-platform Wallpaper, Widgets and AppDrawer app.