Hi everyone, my name is Edgar Muniz, and I'm the lead programmer of a powerful 2d game animation tool called Spriter. It exports to a universal XML based file format that can be easily integrated into any authoring tool or game engine, please take a look:kickstartspriter.com
A beta of the free version is available now for download just below the video at the link above, and we'll be releasing the format specification for any developer to have a go at integrating Spriter animation before the end of our Kickstarter campaign.
If its a project you're interested, please spread the word, and ask any questions you may have. Just give us a little time to answer, as there has been a large response, and getting to everyone takes some time.