KickAss is completely free (distributed under MIT License). However, if you appreciate good work, you can donate (by clicking 'Buy my time' button at footer). It aids to my work, time, life and my belief for MIT License ;)
Click & drag admin panel
KickAss has been released as a wordpress plugin.
The admin panel is designed beautifully & carefully, keeping wp's look & feel. Creating slides, adding images, choosing animations or adding text with WYSIWYG editor is as easy as pie & supported natively by wp core.
jQuery fallback on dumb browsers
KickAss is developed keeping modern browsers (CSS3) in mind. But among all good, exists the evil. For browsers not supporting
standards (You-Know-Who), jQuery fallbacks are deployed along with CSS3,
to resonate the same effect in its absence.