Kiwi application monitor - Kiwi application monitor is a small program which lets you monitor your applications/processes, Windows and User activity.
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Battle Encoder Shirase - Software that controls per-process CPU usage: an “active” software CPU cooler.
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Processes - https://www.oneperiodic.com/products/processes/
Wallcat - Enjoy a new, beautiful wallpaper, every day.