dashboard interface for ImageMagick Montage, easily creating sprite sheets out of image groups or sequences
Sheets is an OS X widget that automates the process of building sprite sheets from image sequences. Using ImageMagick, animations can be output in strips, sheets, or with custom settings for scale and tiling. File sheets (contact sheets) can also be generated, with file name and original size clearly labeled under each thumbnail. Large collections are automatically paginated when necessary.
Requires ImageMagick command line utilities. The easiest solution is to use MacPorts for an automated install process (macports.org).