Japan’s MediBang released their updated MangaName 2.0 Android app, back in the summer. Available free on Amazon, it works on the Kindle Fire HD 10″. Also available on Google Play.
It’s a fine simple tool to create a rough comics storyboard, and is unique in being geared to multi-page comics storyboarding rather than screen animation. It appears to be ad-free. It’s a little temperamental on the Kindle HD, but you get used to how it needs things to be done.
Sadly they appear to have removed the multi-page manager feature from their main MediBang Paint desktop Windows software. But this little app still works fine for multi-page planning and re-ordering.