ScreenshotCaptor is an excellent tool that I have used for many years.
It is a useful tool for a tester, able to grab screens, parts of screens, provide annotations, etc., ready for inclusion in issue reports or user manuals.
It has been rock steady and I haven't detected any crashes in years.
This can be downloaded from
https://www.donationcoder.com/Software/Mouser/screenshotcaptor/