It looks awesome, but it’s missing something that I’d be looking for.
I’d like to upload 30 images to your page, have them automaticly arranged by name.
A few options such as ability to resize or reorder a single or a group of individual sprites
Be able to “ignore white spaces” so that sprites can be nearly clumping each other.
To finish it off the ability to download the spritesheet you create in a power of 2 setting or minimum size possible.
As a second downloadable file I’d lke to be able to download as well as your already built canvas and css, and XML and JSON output.
But that’s me wishing to find a free source that does this while being reliable :P