LottieLab - Create and edit Lottie animations.
Unity - The multiplatform game creation tools for everyone.
Lottie - Lottie is an online platform that helps the users in editing and shipping their animations in a few clicks.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Animator - Animator is a small animation tool. Using Animator is really easy. Example : Drop file1.bmp.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.