KSnapshot is described as 'screenshot application for the KDE desktop environment' and is a screenshot capture tool in the photos & graphics category. There are more than 50 alternatives to KSnapshot for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Firefox. The best alternative is ShareX, which is both free and Open Source. Other great apps like KSnapshot are Greenshot, Flameshot, FastStone Capture and PicPick.
ShareX is a free and open source program that lets you capture or record any area of your screen and share it with a single press of a key. It also allows uploading images, text or other types of files to many supported destinations you can choose from.
A powerful, lightweight, yet full-featured screen capture tool that allows you to easily capture and annotate anything on the screen including windows, objects, menus, full screen, rectangular/freehand regions and even scrolling windows/web pages.
Spectacle is a simple application for capturing desktop screenshots. It can capture images of the entire desktop, a single monitor, the currently active window, the window currently under the mouse, or a rectangular region of the screen.