Marionette Studio is an online animation software for 2D games. You can create skeleton based animations directly on the web without installing anything on your computer. Can be used from any browser: Safari, Firefox, Chrome, Internet Explorer. You can define a bone skeleton for your characters, rig them and easily move the bones to create complex animations.
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Pros
Pro Actively maintained
Marionette Studio team is actively involved in the development of this software. There is a changelog available and a public Trello board.
Pro Cloud based solution
Projects and files can be stored in cloud and the is no need for creating backups.
Pro Animation export
Animations can be exported as image packs and using some 3rd party tools can be imported and used in Unity.
Pro Easy to use
Can be used by anyone - intuitive interface and short learning curve.
Pro Web-based software
Easy to be accessed as no software needs to be download or installed on your computer.
Cons
Con It's not free
Con No integration for major game development engines
There is no integration with major game engines such as Unity, Construct 2D, Unreal, Cocos 2dx, etc.