Spine - Spine is 2D animation software designed specifically for software and game development.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Synfig Studio - Just another WordPress site
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Unity 2D - Unity 2D is a powerful and feature-rich game design solution built from the ground up to fulfill every basic and advanced need of the developer.
LightShot - The fastest way to take a customizable screenshot.