Spine - Spine is 2D animation software designed specifically for software and game development.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Tiled - The communication platform for field and inside sales teams.
Grafx2 - GrafX2 is a bitmap paint program inspired by the Amiga programs Deluxe Paint and Brilliance.
GAF Converter - Best game dev solution that converts Flash Pro 2D animations and UI graphics into texture atlas + config and play back in Cocos2d-x, Unity, Starling framework
Piskel - Piskel is a website where designers online create sprites or pixel art.