Creature Alternatives

Spine is 2D animation software designed specifically for software and game development.

SmoothMoves is Unity3D middleware, available on the Asset Store.

Marionette Studio is an online animation software for beginners and professionals. Animate 2D characters and environments in minutes with no prior skills.

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Moho is a tool that create animation from start to end, it has a 2D rigging system of the market and mix it with traditional animation tools to make amazing, professional animations.

Spriter : an intuitive 2D animation tool for video game makers.

GAF: Flash to Unity allows using Flash animations with Unity.

Documentation Anima2D is a 2D Skeletal Animation plugin for use with Unity 5.

2D Toolkit is packed with features for 2D game development in Unity. The plugin supports many third party formats to integrate into the Unity engine.

DragonBones is an open source project for 2D skeletal animation.

An animation tool that used key frame animation for games and movies.

AnimeEffects is a 2D keyframe animation tool based on deformation of polygon meshes.