Unity - The multiplatform game creation tools for everyone.
Free Texture Packer - Free Texture Packer is an open source tool that allows you to pack multiple images into one atlas for you games or sites.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Sprite Monkey - Small and fast but still full-featured sprite sheet editor.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ShoeBox - Free unlimited photo storage, so you can rediscover your photos anywhere. Available for iPhone, iPad, Android, Mac and PC.