Spine - Spine is 2D animation software designed specifically for software and game development.
Synfig Studio - Just another WordPress site
CrazyTalk Animator - CrazyTalk Animator, the next level of 2D animation. Create actors using any photo or illustration.
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.
DragonBones - DragonBones is an open source project for 2D skeletal animation.
Renderforest Video - Free animation and intro maker, slideshow and video creator