AwesomeWallpaper - AwesomeWallpaper plays videos, shows images and system information on your desktop wallpaper
MSI Afterburner - Tool to manage video cards. Shows video card stats (temp, GPU usage, etc.).
Lively Wallpaper - What is it? Lively is a Free and Open-Source Software (FOSS) for animated desktop wallpapers.
ASUS GPU Tweak - ASUS GPU Tweak fully implements TechPowerUp’s GPU-Z analysis and monitoring features.
BioniX Desktop Wallpaper Changer - Free desktop wallpaper picture changer/desktop wallpaper manager software.
Guru3D - Guru of 3D: PC Hardware Reviews and tests