Spine - Spine is 2D animation software designed specifically for software and game development.
StoryMill - Developers and publishers of Mac, Win, and iOS productivity, home and office and writing software such as MacGourmet, Paperless and many more. Based in MN.
CrazyTalk Animator - CrazyTalk Animator, the next level of 2D animation. Create actors using any photo or illustration.
BlankPage - Stay motivated to write, and finish your story
Synfig Studio - Just another WordPress site
Manuskript - Open-source tool for writers.