Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Fliqlo Screensaver - A screensaver that displays the time using a flip clock.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Padbury Clock Screensaver - Minimal screensaver for Mac
LightShot - The fastest way to take a customizable screenshot.
Xscreensaver for Windows - XScreenSaverWin is a Windows port of XScreenSaver. 204 screensavers in XScreenSaver were ported.