Save Hollywood - Play movies as your screen saver
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Padbury Clock Screensaver - Minimal screensaver for Mac
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
HotShots - Hotshots is a screenshot tool with some editing features.
LightShot - The fastest way to take a customizable screenshot.