X Steps Recorder - A clone of Microsoft's Problem Steps Recorder, but for linux.
Gifox - Delightful GIF Recording and Sharing App for macOS
Folge - The fastest tool for creating step-by-step guides.
Giffing Tool - Giffing Tool is simply put: The fastest creator of high quality captioned GIFs available.
Snagit - Screen Capture Software for Windows and Mac
Instagiffer - Create GIFs from anything!