Spine
Synfig Studio
Creature
Spriter Pro by BrashMonkey
Animation Paper
DigiCel FlipBook
Unity 2D
CrazyTalk Animator
CryENGINE
Unreal Engine
Unity
Godot Engine
Blender
Stencyl
GDevelop
Cocos2d
CryENGINE is recommended for experienced game developers and studios that aim to produce high-end, visually impressive games and have the resources to invest in powerful hardware and learning the engine's more complex systems. It's also suitable for projects that demand advanced rendering and graphics capabilities, such as first-person shooters or open-world exploration games.
Synfig Studio - Just another WordPress site
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Creature - Creature 2D Skeletal and Mesh Animation Tool
Unity - The multiplatform game creation tools for everyone.
Spriter Pro by BrashMonkey - Spriter : an intuitive 2D animation tool for video game makers.
Godot Engine - Feature-packed 2D and 3D open source game engine.