Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Wren - Offset your carbon footprint by saving rainforests
LightShot - The fastest way to take a customizable screenshot.
Capture - A great free screen capture utility that allows you to capture either a window or the desktop and save it to either a file or the clipboard.
Snagit - Screen Capture Software for Windows and Mac
Treepoints - Fight climate change and earn rewards