Gifox - Delightful GIF Recording and Sharing App for macOS
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Giffing Tool - Giffing Tool is simply put: The fastest creator of high quality captioned GIFs available.
Shutter - Shutter is a feature-rich screenshot program.
Instagiffer - Create GIFs from anything!
Snipping Tool - Use Snipping Tool to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image