Greenshot: 

Greenshot – a free screenshot tool optimized for productivity.

https://getgreenshot.org/

Greenshot

Greenshot

Monosnap:

https://monosnap.com/ 

Monosnap

Monosnap

PicPick:

PicPick – All-in-one Graphic Design, Best Screen Capture Software, Image Editor, Color Picker, Pixel Ruler and More.https://picpick.app/en/

PicPick

PicPick

Screenpresso:

Screenpresso screen capture allows you to grab an image or video of what you see on your computer screen, annotate, and share with anyone.

https://www.screenpresso.com/

Screenpresso

Screenpresso

ShareX:

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 …

https://getsharex.com/

ShareX

ShareX

TechSmith Capture:

Whether for work, home, or play, TechSmith Capture provides a simple, free way to create basic screenshots and screen recordings and share them with others.

https://www.techsmith.com/jing-tool.html

TechSmith Capture

TechSmith Capture

TinyTake:

Make the most of your screen captures. TinyTake gives you all the tools to capture, annotate, and share screen captures and screen casts for free.

https://tinytake.com/

TinyTake

TinyTake